B = μ₀I/(2πr) = 4π×10⁻⁷ × 10 / (2π × 0.1) = 2 × 10⁻⁵ T
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JEE Main 2026 — Physics Electromagnetism
easy
mcq
2026
Official previous-year question
Verified 30 May 2026.
Question
A long straight wire carries a current of 10 A. The magnetic field at a distance of 0.1 m from the wire is:
Options
- A
2 × 10⁻⁵ T
- B
2 × 10⁻⁶ T
- C
4 × 10⁻⁵ T
- D
4 × 10⁻⁶ T
Solution
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