Physics · 2022
JEE Main · 25 June 2022, Shift 1 · Q40
A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across…
A long straight wire with a circular cross-section having radius $\displaystyle R$, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be :
Official answer
(2)
$\displaystyle B \propto r$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.