JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 25 July 2021, Shift 2, Physics Q15

Question 15 of 90 in this shift, Physics question 15 of 30, Section A.

A 10

\Omega

resistance is connected across 220 V - 50 Hz AC supply. The time taken by the current to change from its maximum value to the rms value is :

(1)2.5 msOfficial answer
(2)1.5 ms
(3)4.5 ms
(4)3.0 ms

Official answer

Option 1

NTA final key.

Chapter: Alternating Current
Topic: RMS and Peak Values
Idea tested: Time from Peak to RMS

Same idea in other shifts

Asked 3× in all

24 Jun 2022, Shift 1 · Q41A resistance of $40\ \Omega$ is connected to a source of alternating current rated 220 V, 50 Hz. Find the time taken by the current to…EasySingle correct
18 Mar 2021, Shift 1 · Q6An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :EasySingle correct

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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.