Question

(a) Define electric flux. Write its SI units

(b) The electric field components due to a charge inside the cube of side 0.1m are as shown

E_x = αx, where α = 500N/C-m

E_y = 0, E_z = 0

Calculate (i) the flux through the cube, and (ii) the charge inside the cube.

Answer 1

(b) (i) φ = – E₁.a₂ + E₂.a₂ = a₂(E₂ – E₁)

(ii) φ = q_in/∈₀

∴ q_in = a₂∈₀ (E₂ – E₁)