A galvanometer is an ammeter that gives the direction of a current, as well as t

Question

A galvanometer is an ammeter that gives the direction of a current, as well as the amount of the current. A large solenoid is connected to a galvanometer, as in the figure below. By passing a current through the solenoid, it is determined that a clockwise current, viewed from above, will deflect the needle to the right, while a counterclockwise current with deflect the needle to the left. All batteries are then disconnected from the solenoid, and a bar magnet is brought down the outside of the solenoid. As this occurs the needle on the galvanometer deflects to the right. Use this information to label the poles of the magnet. Explain.

Explanation / Answer

if Current is in cc direction then the magnetic field generated is into the solenoid as a view from above and it makes the deflection in the right direction and as current is in cc direction thus create a south pole on top of the solenoid.

now when we disconnect voltage and brought the bar magnet into the solenoid, given that the deflection is in right so it must have created a south pole on the solenoid as a view from above, and we know that it should oppose the effect of bar magnet so there is a south pole which we have entered into the solenoid.

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