Wire A,which is of the same material and cross-sectional area as wire B,is twice as long as wire B.If the resistance of wire B is R,what is the resistance of wire A?
A)R
B)2R
C)R/2
D)4R
E)R/4

Question

Quizplus · Accepted Answer

The resistance of a wire is directly proportional to its length. Since wire A is twice as long as wire B, its resistance is twice that of wire B, making the correct answer 2R.

Wire A,which Is of the Same Material and Cross-Sectional Area