Question

If the percentage error in measuring length and diameter of a wire is \(0.1\%\) each, then the percentage error of the resistance of the wire is :

• A. 0.3%
• B. 0.2%
• C. 0.1%
• D. 0.4%

Answer 1

The Correct Option is A

The correct option is (A): 0.3%

R=\frac{pl}{A}

\frac{\triangle{R}}{R}=\frac{\triangle{l}}{l}+2\frac{\triangle{d}}{d}

=0.3%