Q.

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 equilibrium as shown. We now increase the charge on the left pith ball from Q to 2Q while leaving its mass essentially unchanged. Which of the following diagrams best represents the new equilibrium configuration?

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a

b

c

d

answer is D.

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Detailed Solution

Both angles will remain same at any time. It is because, force on the balls will be equal and opposite, although they have different charges. ϕ>θ,  because force has increased. Angles would have been different if masses were different.
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