JEE Main 2026 — Alternating Current Question with Solution
JEE Main 2026 (21 January Shift 2)
Question
A capacitor is first charged fully with potential difference of and disconnected from the battery. The charged capacitor is connected across an inductor having inductance . In of the initial energy in the capacitor is transferred to the inductor. The value of is s.
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
In an LC circuit, energy oscillates sinusoidally.
Initial energy in capacitor is .
When 25% is transferred to the inductor, 75% remains in the capacitor.
Since energy in capacitor varies as , we need .
This gives , so , yielding .
With , we get seconds.
Initial energy in capacitor is .
When 25% is transferred to the inductor, 75% remains in the capacitor.
Since energy in capacitor varies as , we need .
This gives , so , yielding .
With , we get seconds.
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This is a previous-year question from JEE Main 2026, covering the Alternating Current chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.