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Two identical charges are placed at the two corner an equilateral triangle. The potential energy of the system is U. The work done in bringing an identical charge from infinty to the thrid vertex is `xU`. Find value of x

A

U

B

2U

C

3U

D

4U

Text Solution

Verified by Experts

The correct Answer is:
B
`W_(ex)= u_f-u_i , u_i=U= q^2/(4 pi e_0 a) u_f=(3q^2)/(4 pi e_0 a) implies W_(ex)=(2q^2)/(4 pi e_0 a)=2U`
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