A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the

Q: A uniform wire of resistance $R$ is uniformly compressed along its length, until its radius becomes $n$ times the original radius. Now resistance of the wire becomes

a (a) $\frac{{{R_1}}}{{{R_2}}} = {\left( {\frac{{{r_2}}}{{{r_1}}}} \right)^4} \Rightarrow \frac{R}{{{R_2}}} = {\left( {\frac{{nr}}{r}} \right)^4} \Rightarrow {R_2} = \frac{R}{{{n^4}}}$.

SECTION - A [PHYSICS MCQ]

GSEB - English Medium

A uniform wire of resistance $R$ is uniformly compressed along its length, until its radius becomes $n$ times the original radius. Now resistance of the wire becomes

A$\frac{R}{{{n^4}}}$
B$\frac{R}{{{n^2}}}$
C$\frac{R}{n}$
D$nR$

Easy

STD 11 Science
JEE
STD 12 - 3. current electricity
Physics

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