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If the potential difference in a material is 4MV and the thickness of the material is 2m, calculate the dielectric strength.

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If the potential difference in a material is 4MV and the thickness of the material is 2m, calculate the dielectric strength.

(a) 2MV/m

(b) 4MV/m

(c) 6MV/m

(d) 8MV/m

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This key question is from Dielectric Strength topic in portion Capacitance and Capacitors of Basic Electrical Engineering

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Right choice is (a) 2MV/m

Easy explanation: Dielectric strength is the potential gradient required to cause a breakdown in the material. Potential gradient is the ratio of voltage and thickness.

Dielectric strength= V/t= 4/2= 2MV/m.

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