Assertion :Consider two identical charges placed distance $2 d$ apart, along x-axis. The equilibrium of a positive test charge placed at the point $O$ midway between them is stable for displacements along the x-axis. Reason: Force on test charge is zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
If $+$ ve charge is displaced along x-axis, then net force will always act in a direction opposite to that of displacement and the test charge will always come back to its original position.

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