Two circular coils $P & Q$ are coaxial & carry currents $I_{1}$ and $I_{2}$ respectively (all direction are w.r.t. the observer)

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if $I_{1} = 0 & Q$ moves towards $P,$ a current in the opposite direction to that of $I_{2}$ is induced in $P$

when $I_{1} \neq 0$ and $I_{2} \neq 0$ are in the same direction & $Q$ moves towards $P$ then magnitude of both $i_{1}$ and $i_{2}$ could increase.

when $I_{1} \neq 0$ and $I_{2} \neq 0$ are in the same direction & $P$ moves towards $Q$ then magnitude of $i_{1}$ could decrease.

when $I_{1} \neq 0$ and $I_{2} \neq 0$ are in the same direction & $P$ moves towards $Q$ then magnitude of $i_{1}$ could increase.

answer is A, C, D.

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Detailed Solution

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When Q is brought towards P, north and south poles will be induced at p as shown in the figure, which is as a result of additional current in p in opposite direction as that of Q the net current is sum of original current and this induced current.

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