Q 12-07-115JEE MainJEE Main 2021 (24 Feb, Shift 1)Easy
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 ______.
Numerical value type. Enter your answer.
Answer: 440
$\dfrac{N_p}{N_s} = \dfrac{V_p}{V_s} \Rightarrow N_p = 24\times\dfrac{220}{12} = 440$
Solution by Sreeraj P, M.Sc Physics