Question

If a 10C charge is placed in a medium having relative permittivity 5.4, what will be the amount of flux coming out of that charge?

(a) 1*10^11 Nm^2C^-1

(b) 2.1*10^11 Nm^2C^-1

(c) 2.1*10^10 Nm^2C^-1

(d) 7.1*10^11 Nm^2C^-1

I had been asked this question during an interview for a job.

I need to ask this question from Application of Gauss’s Law in section Charges and Fields of Physics – Class 12

Answer 1

Correct answer is (b) 2.1*10^11 Nm^2C^-1

The explanation: Gauss’s Law states that electric flux coming out of a charge is=\(\frac {amount \, of \, charge}{permittivity \, of \, the \, medium}\). In this case, the charge is 1C and permittivity of the medium=5.4*8.85*10^-12. Substituting the values, we get the total flux coming out of the charge is 2.1*10^11 Nm^2C^-1.