Question

In figure +Q charge is located at one of the edge of the cube, then electric flux through cube due to + Q charge is

• A. $\frac{+Q}{{\epsilon }_0}$
• B. $\frac{+Q}{2{\epsilon }_0}$
• C. $\frac{+Q}{4{\epsilon }_0}$
• D. $\frac{+Q}{8{\epsilon }_0}$

Answer 1

Answer: (C)

If the charge is kept at one of the edge of the cube, for enclosing the charge three more cubes are required so, total flux from the 4 cube system is ${\varphi }_T=\frac{Q}{4{\epsilon }_0}$ .
Flux from given cube ${\varphi }_{cube}=\frac{Q}{4{\epsilon }_0}$ .