JEE Main 2007 Physics question

PhysicsElectrostatic Potential and CapacitanceJEE Main 2007

A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

Answer: (4)

Solution

The capacitor ends in exactly the same state as it began (same charge, same capacitance), so the stored energy is

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Question ID VK-038910