Question

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

• 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 1

Answer: (D)

1.21 times, same

Answer 2

Specific resistance remain same and R µ l²

$\left( \frac { \ell ^ { \prime } } { \ell } \right) ^ { 2 }$= $\left( \frac { 1.1 \ell } { \ell } \right) ^ { 2 }$ = 1.21

R¢ = 1.21 R