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Three equal and similar charges are plac...

Three equal and similar charges are placed at `(–a, 0, 0), (0, 0, 0)` and `(+a, 0, 0)`. What is the nature of equilibrium of the charge at the origin-

A

Stable when moved along the Y-axis

B

Stable when moved along Z-axis

C

Stable when moved along X-axis

D

Unstable in all of the above cases

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The correct Answer is:
C
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