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Q.

Two electrons each are fixed at a distance 2d. A third charge proton placed at the midpoint is displaced slightly by a distance x(x <

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a

2πε0md3q212

b

πε0md32q212

c

2q2πε0md312

d

q22πε0md312

answer is D.

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Detailed Solution

Restoring force, FR=-2Fcosθ⇒FR=−2ke2d2+x22×xd2+x2⇒ma=−2ke2d2+x232x Since, x<
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