QJEEM22Phf739: JEE Main 2022 Physics - Class 12 JEEM22Phf739 Solution: A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and…

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QJEEM22Phf739: JEE Main 2022 Physics - Class 12 JEEM22Phf739 Solution: A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and…

A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and an additional resistance R in series (as shown in figure) to run the lamp at its peak brightness, then the value of R (in ohm) will be _____________.

JEE Main 2022 (Online) 27th June Morning Shift Physics - Alternating Current Question 81 English

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Accepted Answer

$R_{b} = \frac{{(25)}^{2}}{5} = 125 Ω$

$I_{r m s} = \sqrt{\frac{5}{125}} = \frac{1}{5} A$

$\Rightarrow \frac{220}{R + 125} = \frac{1}{5}$

$\Rightarrow R = 1100 - 125$

$= 975 Ω$

QJEEM22Phf739: JEE Main 2022 Physics - Class 12 JEEM22Phf739 Solution: A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and…

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