1.

Three charges are placed along x-axis at x = - a x = 0 and x = a as shown in the figure. The potential energy of the system is

Answer»

`-( (1)/(4 pi epsilon_(0)) ) (q^(2))/(a)`
`-( (1)/(4 pi epsilon_(0)) ) (3Q^(2))/(2a)`
`+( (1)/(4 pi epsilon_(0)) ) (q^(2))/(a)`
`+( (1)/(4 pi epsilon_(0)) ) (3q^(2))/(2a)`

ANSWER :B


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