JEE Main 2022 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2022, Shift 2, Physics Q60

Question 60 of 90 in this shift, Physics question 30 of 30, Section B.

Magnetic flux (in weber) in a closed circuit of resistance 20

\Omega

varies with time t(s) as

\phi

= 8t

^{2}

- 9t + 5. The magnitude of the induced current at t = 0.25 s will be _______ mA.

Official answer

250

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

5 Apr 2026, Shift 2 · Q50A circular loop of radius 20 cm and resistance 2 $\Omega$ is placed in a time varying magnetic field $\vec{B}=(2t^2+2t+3)\ \mathrm{T}$ . At…EasyNumerical value
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29 Jan 2024, Shift 1 · Q58A square loop of side 10 cm and resistance $0.7\,\Omega$ is placed vertically in east-west plane. A uniform magnetic field of $0.20\ T$ is…EasyNumerical value
31 Jan 2024, Shift 2 · Q58The magnetic flux $\phi$ (in weber) linked with a closed circuit of resistance $8\ \Omega$ varies with time (in seconds) as…EasyNumerical value
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
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
27 Jul 2022, Shift 2 · Q54A conducting circular loop is placed in X - Y plane in presence of magnetic field $\vec{B}=\left(3t^3\hat{j}+3t^2\hat{k}\right)$ in SI…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.