Question

A wire is doubled on it. What will be it's new resistance.

Answer 1

Answer:

Here is your Answer

Explanation:

The resistance R is directly proportional to lenght of a wire and inversely proportional to it's cross sectional area. Therefore, If the length of the wire is stretched uniformly to 2 times its original length, then the cross-sectional area is reduced to 1/2 times because the volume ( V = AL) remains the same.

Since the resistivity of the material constant, thus calculate the resistance of the wire.

Hence, resistance of the wire increased by 4 times.