A wire of length L and resistance R is now drawn out by pulling such that its new length is 1.5L. What is its new resistance? Assume the density remains constant.)

Question

Quizplus · Accepted Answer

The resistance of a wire is directly proportional to its length, so as the length of the wire increases by 1.5 times, its resistance will also increase by a factor of 1.5. Therefore, the new resistance will be 2.25 times the original resistance, or 2.25R. So the correct answer is C.

A Wire of Length L and Resistance R Is Now