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ntExplain ' The assumption that the wire is infinitely long is very important. Without this assumption, we cannot take electric field to be perpendicular to the curved part of the cylinderical Gaussian surface. The expression of electric field ie, E =[x/2(pie)(permittivity of free space)r] where x = linear charge density and r = radius of cylindrical Gaussian surface, is true largely at the central portion of the wire length and not really true at the ends of the wire.'n |
| Answer» ntExplain ' The assumption that the wire is infinitely long is very important. Without this assumption, we cannot take electric field to be perpendicular to the curved part of the cylinderical Gaussian surface. The expression of electric field ie, E =[x/2(pie)(permittivity of free space)r] where x = linear charge density and r = radius of cylindrical Gaussian surface, is true largely at the central portion of the wire length and not really true at the ends of the wire.'n | |