A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively.

Options

A. Both remain the same
B. 1.1 times, 1.1 times
C. 1.2 times, 1.1 times
D. 1.21 times, same

Answer

D

Explanation

For stretched wire
`R prop l^(2) rArr R_(1)/R_(2) = (l/(1.1 l))^(2) rArr R_(2) = 1.21 R_(1)`
`rho to` Same, because it is independent from the dimension.