Question

the coils A and B are wrapped around a non conducting cylinder coil A connected to a battery and a key and coil B with the galvanometer.
A) when will the galvanometer show deflection.
B) state the phenomenon.
C)what is the effect in coil a when the plug key is pressed?

Answer 1

A) when current is induced in coil A , current will be induced in coil B as a result the galvanometer will show us a deflection 

B) the phenomenon is called electromagnetic induction 
    the current is induced in coil B since it's e.m.f. is disturbed 

C) Current will pass through it and as a result it will act as a temporary magnet