Question

Three small spheres, each carrying a charge $q$ are placed on the circumference of a circle of radius $R$, forming an equilateral triangle. If we place another charge $Q$ at the center of the circle, then the force on $Q$ will be

• A. zero
• B. $\frac{1}{4\pi {ϵ}_0}\times \frac{qQ}{R^2}$
• C. $\frac{1}{4\pi {ϵ}_0}\times \frac{2qQ}{R^2}$
• D. $\frac{1}{4\pi {ϵ}_0}\times \frac{3qQ}{R^2}$

Answer 1

The correct option is A zero

Charge $=q$

radius $=R$

another charge $=Q$

force on $Q$ will be zero because force does not affect the $Q$.