The electric charges are distributed in a small volume. The flux of the electric field through a sphere of radius 10 cm surrounding the total charge is 20 Vm. The flux over a concentric sphere of radius 20 cm will be:

20 Vm

The correct answer is Option (1) → 20 Vm

According to Gauss law's -

flux, $\phi_E=\frac{q_{enc}}{ε_0}$

∴ flux only depends on the charge enclosed.

Hence, flux over a concentric circle of radius 20 cm is also $20 Vm$.