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Two circular coils-1 and coil-2 are kept...

Two circular coils-1 and coil-2 are kept close to each other as shown in the diagram. Coil-1 is connected to a battery and key and coil-2 with a galvanometer. State your observation in the galvanometer:

(a) When key K closed.
(b) When key K is opened, Give reason for your observations.

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