For the given electromagnetically couple...

For the given electromagnetically coupled circuits: (S is initially in closed state)

When switch S is opend, current in R' flows from a to b.

When switch S is opend, current in R' flows from b to a.

When coil B is brought closer to coil A (with S closed) current in R' flows from b to a

When R is decreased (with S closed ) then current in R' flows from b to a.

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The correct Answer is:

A, C, D

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