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MCAT Question A Day - 8/29/13 - Answer!

What is the potential difference between point A and point B if 10 J of work is required to move a charge of 4.0 C from one point to the other?

A.  0.4 V
B.  2.5 V
C.  14 V
D.  40 V

The correct answer is (B). Potential difference between two points in an electric field is the work per unit charge required to move a charge between the two points: V = W/q = joules/coulomb = volts

 = 10 J/4.0 C = 2.5 V