Question

A silver wire has temperature coefficient of resistivity $4\times10^{-3}$/°C and its resistance at $20^\circ$C is $10\,\Omega$. Neglecting any change in dimensions due to the change in temperature, its resistance at $40^\circ$C is}

• A. $0.8\,\Omega$
• B. $1.8\,\Omega$
• C. $9.2\,\Omega$
• D. $10.8\,\Omega$
• E. $11.6\,\Omega$

Hint:

Always use $R = R_0(1+\alpha \Delta T)$ for small temperature changes and metals.

Answer 1

Answer: (E)