Question

An electric field E is present perpendicular to a square plate of side length L. What is the flux passing through the plate?

(a) LE

(b) L^2E

(c) \(\frac {L^2}{E}\)

(d) Zero

The question was posed to me by my college professor while I was bunking the class.

The query is from Gauss’s Law in section Charges and Fields of Physics – Class 12

Answer 1

Right option is (b) L^2E

Best explanation: We know that electric flux is equal to the product of the electric field and the surface area of a surface. In this case, the plate has surface area L*L = L^2 and hence the net flux passing through the surface is = L^2E.