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MCAT Question A Day - 1/6/14 - Answer!

What happens to the resistance of a wire if its cross-sectional area is doubled?

A.  R is doubled.
B.  R is halved.
C.  R is quadrupled.
D.  R is quartered.

The correct answer is (B). Resistance is inversely proportional to the area; double the area and you reduce the resistance by half.