JEE Main 2023 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 15 April 2023, Shift 1, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

A 12 V battery connected to a coil of resistance 6

\Omega

through a switch, drives a constant current in the circuit. The switch is opened in 1 ms. The emf induced across the coil is 20 V. The inductance of the coil is :

(1)5 mH
(2)8 mH
(3)10 mHOfficial answer
(4)12 mH

Official answer

Option 3

NTA final key.

Chapter: Electromagnetic Induction
Topic: Inductance
Idea tested: Self-Inductance and Back EMF

Same idea in other shifts

Asked 6× in all

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6 Apr 2024, Shift 2 · Q44In a coil, the current changes from $-2$ A to $+2$ A in 0.2 s and induces an emf of 0.1 V. The self inductance of the coil is :EasySingle correct
26 Jun 2022, Shift 1 · Q55A 10 $\Omega$ , 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current…EasyNumerical value
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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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.