JEE Main 2022 — Magnetic Effects of Current Question with Solution
JEE Main 2022 (25 Jun Shift 1)
Question
A long straight wire with a circular cross-section having radius , is carrying a steady current . The current is uniformly distributed across this cross-section. Then the variation of magnetic field due to current with distance from its centre will be
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Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Using Ampere's law and noting that the steady current is uniformly distributed over the cross-section of the cylindrical wire.
Thus, magnetic field from the centre for .
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This is a previous-year question from JEE Main 2022, covering the Magnetic Effects of Current chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.