Physics · 2021
JEE Main · 17 March 2021, Shift 1 · Q4
A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current of 5 A.…
A solenoid of $\displaystyle 1000$ turns per metre has a core with relative permeability $\displaystyle 500$ . Insulated windings of the solenoid carry an electric current of $\displaystyle 5$ A . The magnetic flux density produced by the solenoid is : (permeability of free space $\displaystyle =4 \pi \times 10^{-7} \mathrm{H} / \mathrm{m}$ )
Official answer
(4)
$\displaystyle \pi \mathrm{T}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.