Solved UPSC CDS/OTA Question
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Q · MagnetismDifficult · 45s
A long straight conductor carries a current of 10 A. The magnetic field at a point 2 cm away from it is: 2
TopicMagnetism
Question Typemultiple choice
DifficultyDifficult
Marking+1 / −0.33
Test Duration30 min
Q 1 / 30Next question →
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
B = μ₀I/(2πr) = (4π×10⁻⁷ × 10)/(2π×0.02) = 1×10⁻⁴ T.
10
Final Answer: Option A — 1×10⁻⁴ T
5