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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 27 June 2022, Shift 1, Physics Q52

Question 52 of 90 in this shift, Physics question 22 of 30, Section B.

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 __________.

The figure, in words

Series circuit loop: a lamp labelled '25 V, 5 W' (Lamp), a resistor labelled R, and an AC source symbol (~) labelled '220 V, 50 Hz', all connected in one closed loop.

Official answer

975

NTA final key.

Chapter
Alternating Current
Topic
Phasor Diagrams
Idea tested
Purely Resistive Phasor Diagram

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.