A certain electrical conductor has a square cross-section, ${\rm{2}}{\rm{.0}}\,\,{\rm{mm}}$ on side, and is ${\rm{12 m}}$ long. The resistance between its ends is $0.072\,\,{\rm{\Omega }}$. The resistivity of its material is equal to

$2.4\,\, \times \,\,{10^{ - 8}}\,\,{\rm{\Omega }}\,{\rm{m}}$

$2.4\,\, \times \,\,{10^{ - 6}}\,\,{\rm{\Omega }}\,{\rm{m}}$

$1.2\,\, \times \,\,{10^{ - 6}}\,\,{\rm{\Omega }}\,{\rm{m}}$

$1.2\,\, \times \,\,{10^{ - 8}}\,\,{\rm{\Omega }}\,{\rm{m}}$

NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

A certain electrical conductor has a square cross-section,

\mathrm{2}\mathrm{.0}\,\,\mathrm{mm}

on side, and is

\mathrm{12 m}

long. The resistance between its ends is

0.072\,\,\mathrm{\Omega }

. The resistivity of its material is equal to

View answer and explanation

Correct option: D

2.4\,\, \times \,\,{10^{ - 8}}\,\,\mathrm{\Omega }\,\mathrm{m}

Option D (

160 \Omega, 0.09 \Omega

) is correct because it calculates the primary and secondary load resistances based on the given voltages, power, and efficiency.

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