Question

A wire is drawn through a die, stretching it to four times its original length. By what factor does its resistance increase?

a. 4
b. 8
c. 16
d. 2

Answer 1

When a wire is stretched, its resistance increases. The increase in resistance is directly proportional to the increase in length of the wire. In this case, the wire is stretched to four times its original length, so the resistance will increase by a factor of four.

Step-by-step explanation:

When a wire is stretched, its resistance increases. The increase in resistance is directly proportional to the increase in length of the wire.

In this case, the wire is stretched to four times its original length. So, the resistance will increase by a factor of four.

Therefore, the answer is a. 4.