Question

a wire having resistance 20 ohm is stretched by 5%. The new resistance of the wire is?

Answer 1

Answer:

The length is doubled by uniform stretching i.e.area is reduced to half,volume remaining constant. The resistance is directly proportional to length which is doubled,and inversely proportional to area that is reduced to half,hence the new resistance will be 4 times the original resistance.

Answer 2

Answer:

Refer to the attachment

Explanation:

Answer= 22.05 ohm