MCAT Physics Question — Wire Resistance | Next Step Test Prep MCAT Physics Question — Wire Resistance | Next Step Test Prep

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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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