FIGURE 1 26 (a) Electric field due to an
infinitely long thin straight wire is radial,
(b) The Gaussian surface for a long thin
wire of uniform linear charge density Rationalised 2023-24
34
Physics
Flux through the Gaussian surface
=
flux through the curved cylindrical part of the surface
=
E × 2prl
The surface includes charge equal to l l Gauss’s law then gives
E × 2prl = ll/e0
i