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Q.

 Three charges 4q, Q and 2q are placed at positions 0,  l/2  and l respectively  along a straight line. If the resultant force on 2q is zero, then Q is equal to____

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a

−2q

b

−q

c

−q/2

d

4qt

answer is A.

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Detailed Solution

Q=?           FQ+F4q=0

FQ=−F4q

14πε0Q2q(l/2)2=−14πε02q(4q)l2

4Ql2=−4ql2

Q=−q

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