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Which, among the following, is the correct expression for electric flux density?

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Which, among the following, is the correct expression for electric flux density?

(a) D=epsilon*E

(b) D=epsilon/E

(c) D^2=epsilon*E

(d) D=epsilon*E^2

The question was asked during an online exam.

My doubt stems from Electric Field Strength and Electric Flux Density in chapter Capacitance and Capacitors of Basic Electrical Engineering

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The correct option is (a) D=epsilon*E

To explain: Electric flux density is directly proportional to the electric field, epsilon(permittivity of free space) being the constant of proportionality. Hence D=epsilon*E.

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