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. $\frac{ q }{\varepsilon_{0}}$
• B. $\frac{ q }{2 \varepsilon_{0}}$
• C. $\frac{q}{4 \varepsilon_{0}}$
• D. $\frac{q}{2 \pi \varepsilon_{0}}$

Answer 1

Answer: (B)

Total flux through complete spherical surface is $\frac{ q }{\varepsilon_{0}}$
So the flux through curved surface will be $\frac{ q }{2 \varepsilon_{0}}$. 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.