Q. The inward and outward electric flux from a closed surface are respectively $8 \times 10^{3}$and$\ 4 \times 10^{3}$ units. Then the net charge inside the closed surface is
A) $- 4 \times 10^{3}C$
B) $4 \times 10^{3}C$
C) $\frac{- 4 \times 10^{3}}{\varepsilon_{0}}C$
D) $- 4 \times 10^{3}\varepsilon_{0}C$
Explanation
(d) The charge inside the closed surface is given by
q=net electric flux pass through the surface $\times \varepsilon_{0}\ $
$q = \left( 4 \times 10^{3} - 8 \times 10^{3} \right)\varepsilon_{0}$
Therefore,
$q = - 4 \times 10^{3}\varepsilon_{0}C$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.