No, it isn't. The potential difference is E/Q = 0.8/4*10^-3 = 200 V
Is this supposed to be a true/false question? Or do you just want your answer checked?
When a charge of -4 x 10 to the minus 3 coulombs is moved between two points in an electric field, 0.8 joules of work are done on the charge. The potential difference between the two points is 300 V.
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