Question

What is the electric flux density in free space if the electric field intensity is 1V/m?

(a) 7.76*10^-12C/m^2

(b) 8.85*10^-12C /m^2

(c) 1.23*10^-12C /m^2

(d) 3.43*10^-12C /m^2

This question was addressed to me by my school principal while I was bunking the class.

This intriguing question comes from Electric Field Strength and Electric Flux Density topic in division Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

Right choice is (b) 8.85*10^-12C /m^2

Easy explanation: The formula for electric filed density is:

D=epsilon*E = 1*8.85*10^-12 = 8.85*10^-12C /m^2.