Q.

Two charges q and – 3q are fixed on x-axis separated by distance d. Where should a third charge 2q be placed from A such that it will not experience any force?

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a

d-3d2

b

d+3d2

c

d+3d2

d

d-3d2

answer is B.

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Detailed Solution

From A distance is x from B it is d+x.qx2=3qd+x2 d+xx=3  solving  x=d23+1
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