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

Answer 1

Answer: (B)

Total flux through complete spherical surface is $\frac{q}{{\epsilon }_0}$
So the flux through curved surface will be $\frac{q}{2{\epsilon }_0}$. The flux through flat surface will be zero.
Remark : Electric flux through flat surface is zero but no option is given, option is available for electric flux passing through curved surface.