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If the dielectric strength of a material is 4MV/m and its potential difference is 28MV, calculate the thickness of the material.

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If the dielectric strength of a material is 4MV/m and its potential difference is 28MV, calculate the thickness of the material.

(a) 4m

(b) 7m

(c) 5m

(d) 11m

The question was posed to me in an interview for job.

Query is from Dielectric Strength in division Capacitance and Capacitors of Basic Electrical Engineering

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The correct option is (b) 7m

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

V/dielectric strength= t= 28/4=7m.

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