Two point charges are kept at a certain distance from one another. Figure represents the variation of the potential along the straight line connecting the two charges. At what point is the electric field zero?
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Correct option is D)
The electric field is E=−dxdV At 1 and 2, V=0 So the electric filed at 1 and 2 may be zero. At 3, V is maximum, so dxdV=0, thus the electric field must be zero at 3.