A rod is hinged (free to rotate) ast its...

A rod is hinged (free to rotate) ast its centre O as shown in figue. Two point charge `+q` and `+q` are kept at its two ends. Rod is placed in uniform electric field E as shown. Space is gravity free. Choose the correct options.

net force from the hinge on the rod is zero

net force from the hinge one the rod is leftwards

Equilibrium of rod is neutral

Equilibrium of rod is stable

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The correct Answer is:

B, C

Higher force `=2qE` (towards left)

If we displace the rod `tau_1=tau_2 or tau_("net")=0` in displaced position too. Hence, equilibrium is neutral.

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