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MCAT Physics Question — Wire Resistance

Resistance in a wire depends on:

I. cross-sectional area
II. the material comprising the wire
III. the length of the wire

a) I only

b) I and II only

c) II and III only

d) I, II and III

Explanation

Resistance in a wire follows the equation R=ρL/A where ρ is a property of the wire material, L is the length of the wire, and A is the cross-sectional area of the wire.

a) I only, incorrect.

b) I and II, incorrect.

c) II and III, incorrect.

d) I, II and III, correct.

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