Physics · Electrostatics

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:

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The yz-plane at x = 0 carries a uniform surface charge density &sigma;. A unit point charge is moved from a point (&delta;, 0, 0) on one side of the plane to a point (-&delta;, 0, 0) on the other side. If &delta; is an infinitesimally small positive number, the work done in moving the charge is: