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I'm getting +320 instead of -320The Electric Field is upwards hence the Potential of the upper plate should be lower than the lower plate.
EFS= V/d
60000= - x - 80/4x10^-3
x= -320 (A)
x-80/0.004=60000 then x is 320
is it -320+-80 or -320--80?
bcos x-80=240