Using Amperes circuital law: B × 2πr = μ₀I. Therefore B = μ₀I/(2πr)
Back to JEE Main 2022 Electromagnetism
JEE Main 2022 — Physics Electromagnetism
easy
mcq
2022
Official previous-year question
Verified 30 May 2026.
Question
The magnetic field at a distance r from a long straight wire carrying current I is:
Options
- Aμ₀I/(2πr)
- Bμ₀I/(4πr)
- Cμ₀I/(2πr²)
- Dμ₀I/(4πr²)
Solution
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