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MHT CET Physics question

PhysicsElectrostatic Potential and CapacitanceMHT CET

The plates of parallel plate capacitor are charged upto 100 V. A 2 mm thick plate is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the plate is

Answer: (A)

Solution

With charge fixed, the same p.d. needs the same capacitance: , so ,

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Question ID VK-075469