Q. Two conducting spheres of radii $5\ cm$ and $10\ cm$ are given a charge of $15\mu C$ each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is
A) $5\mu C$
B) $10\mu C$
C) $15\mu C$
D) $20\mu C$
Explanation
(b) Charge on smaller sphere
$= Total\ charge\left( \frac{r_{1}}{r_{1} + r_{2}} \right) = 30\left( \frac{5}{5 + 10} \right) = 10\mu C$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.