Which of the following actions would not deflect the galvanometer needle, why no

Question

Which of the following actions would not deflect the galvanometer needle, why not? Also why would the galvanometer needle deflect in these situations if the galvanometer needle did not move? Be specific.

A. disconnecting the wire from the battery in circuit 1

B. moving the two circuits closer together

C. disconnecting the wire in circuit 2 from the galvanometer

D. moving the circuits further apart

E. moving a third circuit, identical to circuit 1, close to circuit 2

Explanation / Answer

galvanometer needle did not move if

A. disconnecting the wire from the battery in circuit 1, means no current in circuit 1, no induced emf in circiut 2 so no difflection.
C. disconnecting the wire in circuit 2 from the galvanometer, if wire disconnected no current ==> no difflection
D. moving the circuits further apart, farther apart less deflection, closer together more deflection
E. moving a third circuit, identical to circuit 1, close to circuit 2, deflection would be less

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B. moving the two circuits closer together, less diitance between the circuits more deflection.

   becauese induced emg only caused the galvanometer deflection.

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