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

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

Answer Details

When a bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer, the galvanometer will show no deflection if there is no relative motion between the magnet and the solenoid. This is because the magnetic field of the bar magnet induces an electric current in the solenoid due to the changing magnetic flux. The direction and magnitude of the induced current depends on the relative motion between the magnet and the solenoid, as well as the direction and strength of the magnetic field. If there is no relative motion between the magnet and the solenoid, the magnetic flux through the solenoid remains constant, and there is no change in the induced current. Therefore, the galvanometer shows no deflection. On the other hand, if the magnet is moved towards the stationary solenoid, the magnetic flux through the solenoid increases, which induces a current in the opposite direction. This produces a deflection in the galvanometer in one direction. Similarly, if the magnet is moved away from the stationary solenoid, the magnetic flux through the solenoid decreases, which induces a current in the opposite direction. This produces a deflection in the galvanometer in the opposite direction. If the solenoid is moved away from the stationary magnet, the magnetic flux through the solenoid also decreases, inducing a current in the opposite direction. This produces a deflection in the galvanometer in the opposite direction. In summary, the galvanometer shows no deflection when there is no relative motion between the magnet and the solenoid, and the magnetic flux through the solenoid remains constant.