Three large conducting plates A, B and C having charges +q, -2q and +q as shown in fig. The gaps l₁ and l₂ are small and l₁ > l₂ . The plates A and C are fixed and B is free to move. Neglect gravity. If switch S is closed, the plate B will start moving towards

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First move towards left and then towards right

Right

will not move

Left

answer is B.

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Detailed Solution

As, l₁ > l₂, force on the plate B due to the charge on the right face of ‘A’ is lesser than that due to the charge on the left face of plate C. Hence it moves towards ‘C’.

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