Two circular coils P & Q are placed coaxially & carry currents I₁ and I₂ respectively (all direction are w.r.t. the observer)

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When I₁ $\neq$ 0 and I₂ $\neq$ 0 are in the same direction & Q moves towards P then magnitude of both I₁ and I₂ could increase.

When I₁ $\neq$ 0 and I₂ $\neq$ 0 are in the same direction & P moves towards Q then magnitude of I₁ could decrease.

If I₁ = 0 & Q moves towards P, a current in the opposite direction to that of I₂ is induced in P

When I₁ $\neq$ 0 and I₂ $\neq$ 0 are in the same direction & P moves towards Q then magnitude of I₁ could increase.

answer is A, C, D.

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Detailed Solution

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.

When I₁ $\neq$ 0 and I₂ $\neq$ 0 are in the same direction & distance between P and Q is decreased, then induced current in coil P will be in anti-clockwise direction, thus decreasing overall value of current I₁.

Also, this action will induce current in coil Q in anti-clockwise direction, thus decreasing overall value of current I₂as well.

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