JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 30 January 2024, Shift 1, Physics Q58

Question 58 of 90 in this shift, Physics question 28 of 30, Section B.

A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth in that region is 0.5 G and angle of dip is

30^\circ

. The emf induced across the blades is N

\pi\times10^{-5}

V. The value of N is ________.

Official answer

NTA final key.

Chapter: Electromagnetic Induction
Topic: Faraday's Law
Idea tested: Rotational Motional EMF

Same idea in other shifts

Asked 5× in all

5 Apr 2026, Shift 2 · Q36A metal rod of length $L$ rotates about one end at origin with a uniform angular velocity $\omega$ . The magnetic field radially falls off…HardSingle correct
4 Apr 2024, Shift 2 · Q53A rod of length 60 $cm$ rotates with a uniform angular velocity 20 rad $s^{-1}$ about its perpendicular bisector, in a uniform magnetic…MediumNumerical value
15 Apr 2023, Shift 1 · Q58A 20 cm long metallic rod is rotated with 210 rpm about an axis normal to the rod passing through its one end. The other end of the rod is…MediumNumerical value
26 Jun 2022, Shift 2 · Q44A metallic conductor of length 1m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5…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.