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Q.

Three charges +4q, Q and q are placed in a straight line of length I at points distant 0, l/2 and / respectively. What should be the value of Q in order to make the net force on q to be zero? 

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a

-q

b

-q/2

c

4q

d

-2q

answer is A.

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Detailed Solution

Force on q =kQql22+k(4q)ql2=0

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Q = -q

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Three charges +4q, Q and q are placed in a straight line of length I at points distant 0, l/2 and / respectively. What should be the value of Q in order to make the net force on q to be zero?