Consider the situation shown in figure ....

Consider the situation shown in figure .The width of each plate is b.The capacitor plates are rigidly clamped in the laboratory and connected to be a battery of emf `epsilon` All surfaces are friction less .Calculate the value of`M` for which the dielectric slab will stay in equilibrium.

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The correct Answer is:

`(in_(0)bv^(2)(k-1))/(2dK_(s))`

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