JEE Main 2021 — Alternating Current Question with Solution
From: JEE Main 2021 (Online) 24th February Morning Shift
Question
A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ___________.
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Show full solutionCorrect answer: 440
Correct answer
440
Step-by-step explanation
In a transformer,
where, Np = number of turns in primary circuit, Ns = number of turns in secondary circuit = 24, Vp = potential of primary circuit = 220 V and Vs = potential of secondary circuit = 12 V
where, Np = number of turns in primary circuit, Ns = number of turns in secondary circuit = 24, Vp = potential of primary circuit = 220 V and Vs = potential of secondary circuit = 12 V
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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.