A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?
the magnet is moved towards the stationary solenoid
there is no relative motion
the magnet is moved away from the stationary solenoid
the solenoid is moved away from the stationary magnet
Explanation
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When a bar magnet is placed near a solenoid and there is relative motion between them, a changing magnetic field is created in the solenoid. This changing magnetic field induces an electromotive force (emf) in the solenoid, which causes a current to flow in the circuit and deflects the pointer of the galvanometer.
However, if there is **no relative motion** between the bar magnet and the solenoid, the magnetic field in the solenoid does not change and no emf is induced. As a result, no current flows in the circuit and the pointer of the galvanometer shows **no deflection**. So, the correct answer is **B. there is no relative motion**.
