Loyola College B.Sc. Physics April 2008 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FG 45

 

FOURTH SEMESTER – APRIL 2008

PH 4500 – ELECTRICITY & MAGNETISM

 

 

 

Date : 26/04/2008                Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART A                                       (10 x 2m = 20 m)

ANSWER ALL THE QUESTIONS

 

  • State Gauss’s theorem of electrostatics.
  • Three parallel plate capacitors with capacitance values 1 μF, 2 μF and 3 μF are connected in series. Find the effective capacitance value.
  • What is Seebeck effect?
  • Write down the chemical reactions taking place at the plates of a Daniel cell.
  • What is a Helmholtz galvanometer?
  • Define mutual inductance of a coil.
  • Represent graphically the growth and decay of a current in an inductance coil when connected across a dc supply.
  • Explain the term ‘power factor’ of an ac circuit.
  • What is magnetic susceptibility and how is it related to magnetic permeability?
  • Give the expression for the Poynting vector. What does it signify?

 

PART B                                   (4 x 7 ½ m= 30 m)

ANSWER ANY FOUR QUESTIONS

 

  • Obtain an expression for the loss of energy in sharing of charges between two capacitors.
  • Explain the theory of determining the resistance of a coil using Carey Foster’s bridge.
  • Derive an expression for the magnetic field on the axis of a current carrying narrow circular coil.
  • Obtain an expression for the growth of charge in a capacitor when connected across a dc supply and a resistor.
  • Explain the domain theory of ferromagnetism.

 

PART C                                (4 x 12 ½ m = 50 m)

  ANSWER ANY FOUR QUESTIONS

 

  • Obtain expressions for potential and intensity of electric field due to an electric dipole.
  • Apply thermodynamics to a thermocouple to obtain expressions for Peltier and Thomson emfs.
  • Discuss the theory of moving coil galvanometer to find expression for the deflection in terms of current.
  • Discuss the mathematical theory of a LCR series ac circuit and obtain the condition for resonance.

20) Write down the Maxwell’s equations in source free region and prove that electromagnetic               wave travel in free space with the speed of light.

 

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Loyola College B.Sc. Physics Nov 2008 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

CC 10

 

FIFTH SEMESTER – November 2008

PH 5505 – ELECTRICITY & MAGNETISM

 

 

 

Date : 05-11-08                       Dept. No.                                          Max. : 100 Marks

Time : 9:00 – 12:00

SECTION – A

Answer ALL the questions.                                                                                         (10×2 = 20 Marks)

 

  1. Calculate the electric intensity required to just support a water droplet of mass

10-9 kg having a charge of 4.9 × 10-12 coulomb.

  1. What is meant by dielectric constant of a medium?
  2. Define thermoelectric power. What is a thermo – electric diagram?
  3. State Faraday’s laws of electrolysis.
  4. State Ampere’s circuital law.
  5. Calculate the self-inductance of a 1 metre long solenoid of 400 turns and 5 cm diameter.
  6. What do you understand by the time constant of a circuit containing inductance and resistance?
  7. Why is a choke coil preferred to a resistor in an ac circuit?
  8. What is meant by hysteresis?
  9. What is Poynting vector? Give its significance.

SECTION – B

Answer any FOUR questions.                                                                                                 (4×7.5 = 30 marks)

  1. Derive an expression for the capacity of a parallel plate capacitor. What will be the capacity if the space between the plates is partially filled with a slab of thickness t and dielectric constant εr?
  2. Explain, with necessary theory, how a Carey-Foster bridge is used to determine the resistance of a coil of wire.
  3. Discuss the theory of Helmholtz double coil galvanometer.
  4. Discuss the theory of a  parallel resonant circuit. Mention its use.
  5. Give an account of Maxwell’s equations. What is the significance of displacement current?

 

SECTION – C

Answer any FOUR questions.                                                                                             (4×12.5 = 50 Marks)

  1. State and prove Gauss’s law in electrostatics. Apply it to find the electric intensity inside and outside a uniformly charged sphere.

 

  1. (a) Show that  π= TdE/dT and (ii) d/dT (π/T)+(σab)/T=0                                          (10.5 marks)

(b)   The emf (micro volts) in a thermocouple, one junction of which is at

0˚C is given by E=1788t – 3t2 where t is temperature in degree celcius.

Find the neutral temperature.                                                                                (2 marks)

  1. (a) Define coefficient of mutual induction between a given pair of coils.

Describe, with necessary theory, a method of finding it experimentally.                         (10.5 marks)

(b)  A straight solenoid has 60 turns per cm in the primary and 300 turns in the secondary .

The area of cross – section of the solenoid is 5cm2. Calculate the mutual inductance.                  (2marks)

  1. Discuss the theory of oscillatory discharge of a capacitor through an inductance and a resistance.

 

  1. Explain clearly dia, para and ferromagnetism.

 

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Loyola College B.Sc. Physics April 2009 Electricity & Magnetism Question Paper PDF Download

      LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

XC 50

FIFTH SEMESTER – April 2009

PH 5505 / 4500 – ELECTRICITY & MAGNETISM

 

 

 

Date & Time: 24/04/2009 / 1:00 – 4:00  Dept. No.                                                  Max. : 100 Marks

 

 

PART – A

Answer all questions.All questions carry equal marks.      (10 x 2 = 20marks)

 

  1. Define electric dipole moment.
  2. Define the capacitance of a capacitor.
  3. What is thermo electric power?
  4. A reversible cell has an emf of 1 volt at 0 0 C. Assuming that the energy provided by the chemical reactions occurring in the cell amounts to 1.092 J/C, calculate the change in its emf when its temperature rises to 10 C.
  5. Define ampere.
  6. What is Coefficient of coupling ?
  7. If the charge on a capacitor of capacitance is leaking through a high resistance of 100 megaohms is reduced to half its maximum value, calculate the time of leakage.
  8. Differentiate series resonant circuit from parallel resonant circuit.
  9. Mention any two properties of dia magnetic materials.
  10. What is curie temperature ?

 

PART – B

Answer any four questions.                                                         (4×7.5=30marks)

 

  1. Obtain expressions for electric potential and electric field at any point due to a dipole.
  2. Describe the experimental method of determination of specific conductivity of an

electrolyte using kohlrausch bridge.

  1. Derive an expression for the flux density at a point inside a solenoid.
  2. a) Write a note on choke coil (4 marks)
  3. b) A coil has an inductance of 0.1 H and a resistance of 12 ohms. It is connected

to a 220V, 50Hz mains. Determine the (1) reactance of the coil, (2) impedance

of the coil.                                                                                      (3.5 marks)

  1. Using Maxwell’s equations determine the velocity of electromagnetic waves in

free space.

PART – C

Answer any four questions.                                                        (4×12.5=50marks)

 

  1. a) Find an expression for the capacity of a cylindrical condenser.               (7.5 marks)
  2. b) A co-axial cable consists of a copper core of 1mm radius within an outer metal

sheath of 1cm. radius separated by an insulating material of dielectric constant

  1. What is the capacitance per metre length of the cable in pico-farad? (5marks)
  2. Define Peltier and Thomson coefficients and derive expressions for them.
  3. a) Describe the construction of a moving coil galvanometer and derive an expression

for the quantity of charge flowing through it.                                          (9 marks)

  1. b) The successive throws on the same side of the mean position for an oscillating

coil are 25, 24.9 and 24.8 cm. Calculate the logarithmic decrement.       (3.5 marks)

  1. Discuss the growth and decay of charge in an LCR circuit.
  2. Discuss the Langevin’s theory of paramagnetism.

 

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Loyola College B.Sc. Physics Nov 2009 Electricity & Magnetism Question Paper PDF Download

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Loyola College B.Sc. Physics Nov 2010 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – NOVEMBER 2010

PH 5508/PH 5505/PH 4500 – ELECTRICITY & MAGNETISM

 

 

 

Date : 01-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

SECTION – A

Answer ALL  questions.                                                                                         (10 × 2 = 20 marks)

  1. State Guass’s law in electrostatics.
  2. A capacitor of capacity 20μF is charged to a potential of 1000 volt. Calculate the energy stored in the

capacitor.

  1. State Kirchhoff’s laws of distribution of currents in an electrical network.
  2. Distinguish between Peltier effect and Joule effect.
  3. What is meant by Lorentz force?
  4. Define mutual inductance between pair of coils.
  5. A capacitor of capacitance 2μF is discharged through a high resistance. The time taken for half of the

charge on the capacitor to leak is found to be 20 seconds. Calculate the value of the high resistance.

  1. Why a Choke coil is preferred to a resistor in an ac circuit?
  2. Define the terms magnetic susceptibility and magnetic permeability.
  3. What is meant by Poynting vector?

SECTION – B

 

Answer any FOUR questions.                                                                             (4 × 7.5 = 30 marks)

  1. (a) Derive an expression for the electric field at any point due to an electric dipole.

(b) An electric dipole moment 2.5 × 10-8 Cm is placed in a uniform field of intensity 2.0 × 105

NC-1.  How much work is done on turning the dipole end to end?

  1. (a) Define specific conductivity of an electrolyte.

(b) Describe Kohlrausch bridge experiment to determine the specific conductivity of an

electrolyte.

  1. Give the theory of Helmholtz galvanometer.
  2. (a) Derive an expression for the rms value of an alternating current.

(b) Give the theory of choke coil.

  1. (a) Give a brief account of domain theory.

(b) How would you explain ferromagnetism using domain theory?

 

SECTION – C

Answer any FOUR questions.                                                                         (4× 12.5 = 50 marks)

 

  1. (a) Define farad.

(b) A capacitor consists of two concentric spheres. Find the capacitance when (i) the inner sphere is

charged and the outer sphere is earthed and (ii) when the outer sphere is charged and the inner

sphere is earthed.

  1. (a) What is thermo emf?

(b)  Describe a method of measuring thermo emf.

(C) What are thermo electric diagrams?  Mention a few of their uses.

  1. (a) Give the theory of an earth inductor.

(b)  Describe how the earth inductor can be used to determine Earth’s horizontal field induction

BH at a place.

  1. Discuss the theory of decay of charge in an LCR circuit.
  2. Discuss the properties of dia, para and ferromagnetic materials.

 

 

 

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Loyola College B.Sc. Physics April 2011 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2011

PH 5508/PH 5505/PH 4500 – ELECTRICITY & MAGNETISM

 

 

 

Date : 18-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

             

Answer all questions. All questions carry equal marks.                                (10×2=20marks) 

       

  1. Define capacitance of a capacitor.
  2. What is meant by dielectric constant of a medium?
  3. What is Thomson effect?
  4. State Faraday’s laws of electrolysis
  5. A circular coil has a radius of 0.1m and number of turns 50. Calculate the magnetic induction at a distance of 0.2m from the centre when a current of 0.1 A flows in it.
  6. Calculate the self inductance of 1m long solenoid of 400 turns and 5 cm diameter.
  7. Explain time constant in L-R circuit.
  8. Obtain the expression for the mean value of a.c. in terms of the peak value.
  9. Define magnetic susceptibility.
  10. Define Poynting vector.

 

 

PART – B

Answer any four questions.                                                                                 (4×7.5=30marks)

    

  1. State Gauss theorem. Apply it to calculate the electric intensity at a point (i) inside the charged sphere  (ii) outside the charged sphere.
  2. Describe the experimental method of determination of specific conductivity of an electrolyte using Kohlrausch bridge.
  3. Discuss the theory of Helmholtz galvanometer.
  4. Discuss the decay of charge in a capacitative circuit.
  5. Using Maxwell’s equations determine the velocity of electromagnetic waves in free space.

 

 

 

 

 

 

 

 

PART – C

Answer any four questions.                                                                               (4×12.5=50marks)

 

  1. a) Obtain an expression for the capacity of a cylindrical condenser.
  1. b) A cable of wire 3 x 10-3 m in diameter and insulated with 3 x 10-3 m of gutta- percha

(relative permittivity = 4.26 ) is placed in water. Calculate the capacity

for 5 km length of the cable.

  1. Describe the construction and working of a potentiometer and explain how it can

be used to calibrate the given (i) voltmeter       (ii) an ammeter.

  1. With necessary theory, explain the working of a moving coil galvanometer. Show     how to correct the observed throw for damping.
  2. Discuss the theory of parallel resonance circuit and compare it with series resonance circuit.
  3. Compare the characteristic feature of  diamagnetism, paramagnetism and ferromagnetism.

 

 

 

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Loyola College B.Sc. Physics April 2012 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2012

PH 5508/PH 5505/PH 4500 – ELECTRICITY & MAGNETISM

 

 

 

Date : 27-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART- A

 

Answer all questions, All questions carry equal marks:                                              (10 x 2 = 20)

 

  1. Define relative permittivity.
  2. Compute the electric field due at a distance of 2 x10-8 m on a line making an angle of 450 with the dipole axis from the centre of the dipole, the dipole moment, p = 6.4 x 10 -29
  3. Define equivalent conductivity of an electrolyte.
  4. A reversible cell has an e.m.f of 1 volt at 0 o Calculate the change in its e.m.f when its temperature rises to 1 oC, given H = 1.092 J/C.
  5. Give an application of Biot Savart’s law.
  6. State Ampere’s circuital law.
  7. What is meant by wattles current?
  8. Define form factor.
  9. Write down Maxwell’s equations.
  10. Distinguish between dia, para and ferromagnetic substances.

 

PART – B

 

Answer any FOUR questions:                                                                                       (4 x 7.5 = 30)

 

  1. State Gauss’s law. Apply it to determine the electric field due to a uniformly charged sphere at a point P,   a) inside,          b) on and         c) outside the sphere.
  2. Explain the experimental method of using the Carey Foster’s bridge to determine the temperature coefficient of resistance.
  3. Determine the magnetic induction at a point due to a straight conductor carrying current using Biot Savart’s law.
  4. Why is a parallel resonance circuit called as the rejector circuit? Prove that in a parallel resonance circuit, impedance is inversely proportional to the resistance.
  5. Explain domain theory of ferromagnetism.

 

PART – C

 

Answer any FOUR questions:                                                                                     (4 x 12.5 = 50)

 

  1. a) Derive an expression for the capacitance of a parallel plate capacitor. Discuss the effect of a

dielectric in the capacitance of a parallel plate capacitor.

  1. The area of each plate of a parallel plate capacitor is 4 x 10-2 m2. If the thickness of the dielectric medium between the plates is 10-3 m and the relative permittivity of the dielectric is 7, find the capacitance of the capacitor.
  1. Define Peltier and Thomson coefficients. Obtain the relation between the two.
  2. Describe an experiment to determine the mutual inductance between two coaxial solenoids.
  3. Discuss the decay of charge in an LCR circuit.
  4. Explain in detail Langevin’s theory of paramagnetism.

 

 

 

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Loyola College B.Sc. Physics Nov 2012 Electricity & Magnetism Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – NOVEMBER 2012

PH 5508/5505/4500 – ELECTRICITY & MAGNETISM

 

 

 

Date : 03/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

Answer ALL   questions:                                                                                                     (10X 2 = 20)

 

  1. Explain electric dipole and electric dipole moment.
  2. Calculate the energy required to charge in air a metallic sphere of radius 2m to a potential

of 3000 volts.

  1. Define Peltier coefficient.
  2. State Kirchoff’s laws of current electricity.
  3. State Biot –Savart’s law.
  4. Determine the magnetic intensity at a distance of 10 cm due to a long straight conductor

carrying a current of 75A.

  1. Calculate the time of leakage if the charge on a capacitor of capacitance 4 microfarad in leaking through a resistance of 100 megaohms is reduced to half its maximum value.
  2. Why is shock from ac more severe than that from dc?
  3. Define magnetic permeability. Write the relation between relative permeability and susceptibility
  4. Write Maxwell’s equations.

 

 

PART B

 

Answer any  FOUR  questions:                                                                                               (4 x7. 5  = 30 )

 

  1. Obtain an expression for torque and the potential energy of a dipole placed in a uniform

electric field.                                                                                                                                 (4+3.5)

  1. Describe the Kohlausch bridge method to determine the specific conductivity of an electrolyte.
  2. Obtain an expression for the force on a current carrying conductor placed in a magnetic field.
  3. A resistance R and a 4µF capacitor in series are connected to a 200 volt direct supply. Across the capacitor is a neon lamp that strikes at 120 volts. Calculate the value of R to make the lamp strike 10 seconds after switch has been closed.
  4. With help of Maxwell’s equations show that electromagnetic waves are transverse in nature.

 

PART – C

 

Answer any FOUR questions:                                                      (4 x 12.5 = 50)

 

 

  1. (a) Obtain an expression for the capacitance of a parallel plate capacitor.     (5)

(b) What will be the capacitance if the space between the plates is partially filled with a slab of

thickness d and relative permittivity εr?                                                                                     (7.5)

  1. What is a thermo – electric diagram? Explain how Peltier and Thomson emf’s, neutral temperature and temperature of inversion can all be determined using the diagram.                                (3 + 9.5)
  2. (a) Describe the construction of a moving coil galvanometer. Obtain an expression for the quantity of

charge flowing through it.                                                                                                      (3+6)

(b) Explain damping correction.                                                                                                      (3.5)

  1. .Describe the principle, construction and working of a three phase ac generator.
  2. .Discuss Langevin’s theory of para magnetism.

 

 

 

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