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Two positive charges $Q=1\mu C$ are held at a fixed distance $d=10$ cm apart. A particle of mass $m=2$ g and charge $-q=-2\mu C$ is placed midway between them and given a small displacement $x\ll d$ in the direction perpendicular to the line joining the two positive charges, and released.

What is the period of the subsequent oscillatory motion of the particle?

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0.037 s


0.3 s


30 s


We need to know $x$ to solve for the period.

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