JEE Main 2021 — Alternating Current Question with Solution
From: JEE Main 2021 (Online) 25th July Evening Shift
Question
A 10 resistance is connected across 220V 50 Hz AC supply. The time taken by the current to change from its maximum value to the rms value is :
Choose an option
Show full solutionCorrect option: A
Correct answer
A2.5 ms
Step-by-step explanation
i = i0sint
when i = i0
i0 = i0sint1 t1 = ..... (i)
When i =
= i0sint2 t2 = ...... (ii)
Time taken by current from maximum value to rms value
sec
= 2.5 ms
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This is a previous-year question from JEE Main 2021, 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.