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Q.

Two point charges +9e and +e are at 16 cm away from each other. Where should another charge q be placed between them so that the system remains in equilibrium 

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a

12 cm from +e

b

24 cm from +e

c

12 cm from +9e

d

24 cm from +9e

answer is B.

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Detailed Solution

Suppose q is placed at a distance x from +9e, then for equilibrium net force on it must be zero i.e. |F1|=F2

Which gives x1=xQ2Q1+1=16e9e+1=12 cm

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