Question

two pith balls each with mass m are suspended from insulating threads. When the pith balls are given equal positive charge Q, they hang in equilibirum as shown. We now increase the charge on the left pith ball from Q to 2Q while leaving its mass essentially unchanged. Which of he following diagrams best represent the new equilibrium configuration?

A.
B.
C.
D.

Answer 1

Correct Answer - D
Both angle will remain same at any time. It is because, force on the balls will be equal and opposite, although they have different charge. `phigttheta` because force has increased. Angle would have been different if masses were different.