In infinite long uniformly charged string is placed along $z-$ axis. Its linear charge density is $\lambda $. A point charge $q$ is moved from position $(a, 0, 0)$ to $(2a, 0, 0)$ then work done will be
In infinite long uniformly charged string is placed along $z-$ axis. Its linear charge density is $\lambda $. A point charge $q$ is moved from position $(a, 0, 0)$ to $(2a, 0, 0)$ then work done will be
- A
$ - \frac{{K\lambda }}{a}\left( q \right)$
- B
$\frac{{K\lambda q}}{{2a}}\,\ln \,\left( 2 \right)$
- C
$ - 2k\lambda q\,(\ln \,2)$
- D
$ - \frac{{2k\lambda q}}{a}\,(\ln \,2)$
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