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
24 cm from +9e
b
12 cm from +9e
c
24 cm from +e
d
12 cm from +e
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|=F2Which gives x1=xQ2Q1+1=16e9e+1=12 cm