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What happens to the potential difference between the plates of a capacitor as the thickness of the dielectric slab increases?(a) Increases(b) Decreases(c) Remains the same(d) Becomes zeroThis question was addressed to me in a job interview.Enquiry is from Composite Dielectric Capacitor in division Capacitance and Capacitors of Basic Electrical Engineering

Answer»

The correct answer is (B) Decreases

Explanation: When a dielectric is introduced between the plates of a CAPACITOR, its POTENTIAL difference decreases.

New potential difference= potential difference without dielectric-potential difference of dielectric. Hence as the thickness of the dielectric slab INCREASES, a larger value is subtracted from the original potential difference.



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