Question

Four identical charges of charge $q$ are placed at the corners of a square of sides r as shown above. Find the magnitude of the net force acting on a charge of magnitude $2q$ placed in the center of the square.

• A. $0$
• B. $\frac{2k{q}^2}{r^2}$
• C. $\frac{4k{q}^2}{r^2}$
• D. $\frac{16k{q}^2}{r^2}$
• E. $\frac{32k{q}^2}{r^2}$

Answer 1

Answer: (A)

$0$

As the charges are equal and same sign at opposite corners of the square so the forces are equal and opposite at the center. So net force on charge at center will be zero.