Question

A wore of certain material is stretched slowly by $10 \%$. Its new resistance and specific resistance becomes respectively

• A. $1.21$ times, same
• B. both remains the same
• C. $1.1$ times, $1.1$ times
• D. $1.2$ times, $1.1$ times

Answer 1

Answer: (A)

Let $1_{1}=100,1_{2}=110$
$R \propto 1^{2}$
$\frac{ R _{2}}{ R _{1}}=\left(\frac{1_{2}}{1_{1}}\right)^{2}=\left(\frac{110}{100}\right)^{2}=1.21$
$ R _{2}=1.21 R _{1}$
Specific resistance remains same