JEE Main 2022 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 28 June 2022, Shift 2, Physics Q44

Question 44 of 90 in this shift, Physics question 14 of 30, Section A.

A coil is placed in a time varying magnetic field. If the number of turns in the coil were to be halved and the radius of wire doubled, the electrical power dissipated due to the current induced in the coil would be : (Assume the coil to be short circuited.)

(1)Halved
(2)Quadrupled
(3)The same
(4)DoubledOfficial answer

Official answer

Option 4

NTA final key.

Chapter: Electromagnetic Induction
Topic: Faraday's Law
Idea tested: Faraday's Law Magnitude

Same idea in other shifts

Asked 15× in all

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11 Apr 2023, Shift 1 · Q53The magnetic field B crossing normally a square metallic plate of area 4 m $^2$ is changing with time as shown in figure. The magnitude of…EasyNumerical valueHas a figure
12 Apr 2023, Shift 1 · Q58A conducting circular loop is placed in a uniform magnetic field of 0.4 T with its plane perpendicular to the field. Somehow, the radius…MediumNumerical value
25 Jul 2022, Shift 2 · Q60Magnetic flux (in weber) in a closed circuit of resistance 20 $\Omega$ varies with time t(s) as $\phi$ = 8t $^{2}$ - 9t + 5. The magnitude…EasyNumerical value
26 Jul 2022, Shift 2 · Q58In a coil of resistance 8 $\Omega$ ,the magnetic flux due to an external magnetic field varies with time as…MediumNumerical value

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.