Q126 / 199 · NEET 2008 (Mains) · Physics

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

  • A
    1.1 times, 1.1 times
  • B
    1.2 times, 1.1 times
  • Correct answer
    C
    1.21 times, same
  • D
    Both remain the same

Solution

$\begin{aligned} & \frac{R_2}{R_1}=\left(\frac{l_2}{l_1}\right)^2=\left(\frac{1.1 l_1}{l_1}\right)^2=1.21 \\ & R_2=1.21 R \end{aligned}$

Hence, the correct answer is option: 'C'.

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