Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · MagnetismDifficult · 45s
A circular coil of radius 0.1 m has 100 turns and carries a current of 5 A. Magnetic field at its center is: 35
TopicMagnetism
Question Typemultiple choice
DifficultyDifficult
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
B = μ₀NI/(2R) = (4π×10⁻⁷ × 100 × 5)/(2×0.1) = 6.28×10⁻⁴ T.
43
Final Answer: Option B — 6.28×10⁻⁴ T
39