Physics
When the magnet as shown in the diagram, is moved towards the coil at a speed of 5 m s-1, the galvanometer shows a certain deflection to the right.
How will the direction and magnitude of deflection change when the coil also moves with a speed of 5 m s-1:
(a) in the direction of the motion of the magnet?
(b) in the opposite direction of the motion of the magnet?
Electro-Magnetism
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Answer
The deflection of the galvanometer depends on the rate of change of magnetic flux, which depends on the relative motion between the magnet and the coil.
(a) Both the magnet and the coil move in the same direction with the same speed, so there is no relative motion between them and hence, the magnetic flux through the coil does not change.
Therefore, no current is induced and the galvanometer shows no deflection.
(b) Since the magnet and the coil are moving opposite to each other so now the relative speed between them is given by the sum of individual speeds and becomes 10 m s-1 (5 + 5) which increases the rate of change of magnetic flux.
Therefore, the direction of deflection remains the same (to the right), but the magnitude of deflection increases.
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