Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · MagnetismModerate · 45s
In a solenoid, if the number of turns is doubled and the current halved, the magnetic field inside will: 112
TopicMagnetism
Question Typemultiple choice
DifficultyModerate
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
B ∝ NI ⇒ Doubling N and halving I keeps NI constant.
120
Final Answer: Option A — Remain same
115