Question 10:
Imagine that you are sitting in a chamber with your back to one wall. An electron
beam, moving horizontally from back wall towards the front wall, is deflected by a
strong magnetic field to your right side. What is the direction of magnetic field?
Answer:
The direction of magnetic field is given by Fleming’s left hand rule. Magnetic field
inside the chamber will be perpendicular to the direction of current (opposite to
the direction of electron) and direction of deflection/force i.e., either upward or
downward. The direction of current is from the front wall to the back wall because
negatively charged electrons are moving from back wall to the front wall. The
direction of magnetic force is rightward.
Hence, using Fleming’s left hand rule, it can be concluded that the direction of
magnetic field inside the chamber is downward.
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