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A charge q is placed at the mid-point of the line joining two equal charges each of Q. If the whole system is in equilibrium

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A charge q is placed at the mid-point of the line joining two equal charges each of Q. If the whole system is in equilibrium, then the value of q is

1) -Q/2

2) +Q/2

3) -Q/4

4) +Q/4

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1 Answer

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Best answer

Correct Option : 3

Explanation :

Potential energy of the system is equal to zero when the system is in equilibrium. 

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