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JEE Main 202124 FebruaryMorning Shift

Exam: JEE Main
Year: 2021
Date: 24 February
Shift: Morning Shift
Subject: Physics
Chapter: Alternating Current

JEE Main 2021 · 24 February · Morning Shift · Physics · Alternating Current

A common transistor radio set requires 12V (D . C .) for its...

A common transistor radio set requires

12V \left(D . C .\right)

for its operation. TheD . C .

source is constructed by using a transformer and a rectifier circuit, which are operated at

220V \left(A . C .\right)

on standard domestic

A . C .

supply. The number of turns of secondary coil are

24, then the number of turns of primary are

Correct answer

440

Step-by-step solution

$\dfrac{{N}_{P}}{{N}_{S}} = \dfrac{{V}_{P}}{{V}_{S}}$

$\dfrac{{N}_{P}}{24} = \dfrac{220}{12}$

${N}_{P} = \dfrac{220 \times 24}{12}$

${N}_{P} = 440$

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