Physics · 2022
JEE Main · 30 June 2022, Shift 1 · Q45
An electric cable of copper has just one wire of radius 9 mm. Its resistance is 14 Ω. If this single copper wire of the cable is replaced by seven…
An electric cable of copper has just one wire of radius $\displaystyle 9$ mm . Its resistance is $\displaystyle 14 \Omega$. If this single copper wire of the cable is replaced by seven identical well insulated copper wires each of radius $\displaystyle 3$ mm connected in parallel, then the new resistance of the combination will be :
Official answer
(2)
$\displaystyle 18 \Omega$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.