Question

If a charge $q$ is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be:

• A. $\frac{q}{2\pi {\epsilon }_0}$
• B. $\frac{q}{4{\epsilon }_0}$
• C. $\frac{q}{2{\epsilon }_0}$
• D. $\frac{q}{{\epsilon }_0}$

Answer 1

The correct option is C $\frac{q}{2{\epsilon }_0}$

Flux passing through flat surface $=$ Flux passing through curved surface.

So $\varphi =\frac{q}{2{\epsilon }_0}$