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Electric potential decreases uniformly from 180V to 20 Volt from x = -2 to x = 2. What is the electric field at origin?
electric field = potential gradient
E=dV/dL
dV is change in potential = 180-20 = 160 V
dL is change in lenght = 2 - (-2) = 4 units
therefore E = 160/4 = 40 V/unit
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