The yz-plane at x = 0 carries a uniform surface charge density σ. A unit point charge is moved from a point (δ, 0, 0) on one side of the plane to a point (-δ, 0, 0) on the other side. If δ is an infinitesimally small positive number, the work done in moving the charge is
1
0
2
\(\frac{{\rm{\sigma }}}{{{ \in _0}}}{\rm{\delta }}\)
3
\(- \frac{{\rm{\sigma }}}{{{ \in _0}}}{\rm{\delta }}\)
4
\(\frac{{{\rm{2\sigma }}}}{{{ \in _0}}}{\rm{\delta }}\)