Question 4:
Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction
of the induced current changes once in each
(a) two revolutions (b) one revolution
(c) half revolution (d) one-fourth revolution
Answer:
(c) When a rectangular coil of copper is rotated in a magnetic field, the direction
of the induced current in the coil changes once in each half revolution. As a result,
the direction of current in the coil remains the same.
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