Question

A coil of insulated copper wire is connected to a galvanometer. What would happen if a strong bar magnet is:

(A) pushed into the coil?
(B) withdraw from inside the coil?
(C) held stationary inside the coil?

Give justification for each observation.

Answer 1

Answer:

B

Explanation:

withdraw from inside the coil

Answer 2

Required Answer :

(A) When a strong bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, we will observe a deflection in the galvanometer in one direction.

Justification:-

• This is because current is induced in the coil in a particular direction (either clockwise or anti clockwise) due to an increasing magnetic field. This phenomenon is called electromagnetic induction.

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(B) When the magnet is withdrawn from the coil, we will again observe a deflection in the galvanometer but in direction opposite to that observed in (A).

Justification:-

• This is because current is again induced in the coil but in an opposite direction due to a decreasing magnetic field.

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(C) No deflection will be observed when the coil is held stationary as no current will be induced since magnetic field is not changing.