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.
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