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Questions  

A particle of mass m and charge +q  is midway between two fixed charged particles, each having a charge +q  and at a distance  2L apart. The middle charge is displaced slightly along the line joining  the fixed charges and released .The time period of oscillation is proportional to

a
L12
b
L
c
L32
d
L2

detailed solution

Correct option is C

Given Mass of particle= mCharge= +qDistance= 2LWe know electrostatic force  F=14πε0q1q2r2.....(1)Restoring force F=−14πε0q2[1(L−x)2−1(L+x)2]​⇒F=−q24πε0[4Lx(L2−x2)2]​As x<

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