The length of a certain wire is doubled while its radius is kept constant.What is the new resistance of this wire?
A)It stays the same.
B)It is 2 times as large.
C)It is 3 times as large.
D)It is 4 times as large.
E)It is 1/2 as large.

Question

Quizplus · Accepted Answer

The resistance of a wire is directly proportional to its length (R ∝ L) and inversely proportional to the square of its radius (R ∝ 1/r^2). Doubling the length while keeping the radius constant doubles the resistance.

The Length of a Certain Wire Is Doubled While Its