Consider an infinite horizontal surface with fixed surface charge density o, where î is the upward normal to the surface. Ifan electric field ĒL = En is applied from below, the electric field Ē, in the region above the surface is: (b) Ë, =E, +- (a) Ë, = Ë, – 260 260 CAREER ENDEAVOUR (c) Ë, = Ë, –L î
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