Two coils A and B of insulated to wi...

Two coils A and B of insulated to wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key . What would happen if :
(i) a current is passesd through coil B plugging the key ?
(ii) the current is stopped by removing the pulg form the key ?
Explain your answer mentioning the name of the phenomen involved.

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