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Q.

A charge q is placed at the mid-point of the line joining two equal charges Q. the system of three charges will be in equilibrium when q has the value:

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a

-Q / 2

b

Q / 4

c

Q / 2

d

-Q / 4

answer is C.

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q=−Q4

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A charge q is placed at the mid-point of the line joining two equal charges Q. the system of three charges will be in equilibrium when q has the value: