If an increase in length of copper wire is ${\rm{0}}{\rm{.5}}\,\,{\rm{\% }}$ due to stretching, the percentage increase in its resistance will be

$\begin{array}{*{20}{l}} {{\rm{1}}\,\,{\rm{\% }}} \end{array}$

${\rm{0}}{\rm{.1}}\,\,{\rm{\% }}$

${\rm{0}}{\rm{.2}}\,\,{\rm{\% }}$

$\begin{array}{*{20}{l}} {{\rm{2}}\,\,{\rm{\% }}} \end{array}$

NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

If an increase in length of copper wire is

\mathrm{0}\mathrm{.5}\,\,\mathrm{\% }

due to stretching, the percentage increase in its resistance will be

View answer and explanation

Correct option: C

\begin{array}{llllllllllllllllllll} {\mathrm{1}\,\,\mathrm{\% }} \end{array}

Option C (

1\,\%

) is correct because the percentage increase in resistance is approximately twice the percentage increase in length when volume is constant.

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