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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). Whais 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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