Self Induction PYQs: JEE Mains Physics

Showing 1–11 of 11 questions

1. 1. An inductor of inductance \(10\) mH having resistance of \(100\,\Omega\) is connected to battery of E.M.F. \(1.0\) V through a switch as shown in the figure below. After switch is closed, the ratio of instantaneous voltages across the inductor when the current passing through it is \(2\) mA and \(4\) mA is _______.
   2026 Hard
2. 2. Match the List-I with List-II
   

   	List-I		List-II
   A.	Magnetic induction	I.	\(M L T ^{-2} A^{-2}\)
   B.	Magnetic flux	II.	\(ML ^2 T^{-2} A^{-2}\)
   C.	Magnetic permeability	III.	\(ML ^0 T^{-2} A^{-1}\)
   D.	Self inductance	IV.	\(ML ^2 T^{-2} A^{-1}\)

   Choose the correct answer from the options given below: 2026 Hard
3. 3. Regarding self-inductance:
   A. The self-inductance of the coil depends on its geometry.
   B. Self-inductance does not depend on the permeability of the medium.
   C. Self-induced e.m.f. opposes any change in the current in a circuit.
   D. Self-inductance is electromagnetic analogue of mass in mechanics.
   E. Work needs to be done against self-induced e.m.f. in establishing the current.
   Choose the correct answer from the options given below: 2025 Easy
4. 4. In a coil, the current changes form \(-2 \mathrm{~A}\) to \(+2 \mathrm{~A}\) in \(0.2 \mathrm{~s}\) and induces an emf of \(0.1 \mathrm{~V}\). The selfinductance of the coil is _______. 2024 Hard
5. 5. The current in an inductor is given by \(\mathrm{I}=(3 \mathrm{t}+8)\) where \(t\) is in second. The magnitude of induced emf produced in the inductor is \(12 \mathrm{mV}\). The selfinductance of the inductor _______ \(\mathrm{mH}\). 2024 Hard
6. 6. 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  ........... \(mH\) 2023 Medium
7. 7. Two concentric circular coils with radii \(1\,cm\) and \(1000\,cm\), and number of turns \(10\) and \(200\) respectively are placed coaxially with centers coinciding. The mutual inductance of this arrangement will be \(.........\times 10^{-8}\,H\)(Take, \(\pi^2=10\)) 2023 Hard
8. 8. In a fluorescent lamp choke (a small transformer) \(100 \;\mathrm{V}\) of reverse voltage is produced when the choke current changes uniformly from \(0.25 \;\mathrm{A}\) to \(0\;\mathrm{A}\) in a duration of \(0.025 \;\mathrm{ms} .\) The self-inductance of the choke (in \(\mathrm{mH})\) is estimated to be 2020 Medium
9. 9. A copper wire is wound on a wooden frame, whose shape is that of an equilateral triangle. If the linear dimension of each side of the frame is increased by a factor of \(3\), keeping the number of turns of the coil per unit length of the frame the same, then self inductance of the coil 2019 Hard
10. 10. The total number of turns and cross-section area in solenoid is fixed. However, its length \(L\) is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to 2019 Hard
11. 11. When current in a coil changes from \(5\,A\) to \(2\,A\) in \(0 .1\,s,\) average voltage of \(50\,V\) is produced. The self- inductance of the coil is.......\(H\) 2015 Medium

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