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Two point charges +9e and +e are kept 16...

Two point charges `+9e` and `+e` are kept `16 cm`. Apart from each other. Where should a third charge `q` be placed between them so that the system is in equlibrium state:

A

24 cm from +9e

B

12 cm from +9e

C

24 cm from +e

D

12 cm from +e

Text Solution

Verified by Experts

The correct Answer is:
B
`(K(9e)q)/r^(2)=-(Keq)/((16-r)^(2))rArr 3/r=1/(16-r)rArr r=12 cm`
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