The current in an inductor of self-inductance \(4~\mathrm{H}\) changes from \(4~ \mathrm{A}\) to \(2~\mathrm{A}\) in \(1~ \mathrm s\) . The emf induced in the coil is:
1. \(-2~\mathrm V\)
2. \(2~\mathrm V\)
3. \(-4~\mathrm V\)
4. \(8~\mathrm V\)

Subtopic:  Self - Inductance |
 81%
From NCERT
NEET - 2022
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The self-inductance of a long solenoid of cross-section \(A,\) total length \(L\) and total number of turns \(N,\) is (approximately):
1.  \(\frac{\mu_0A}{L}\cdot N\)
2.  \(\frac{\mu_0A}{L}\cdot N^2\)
3.  \(\frac{\mu_0L^3}{A}\cdot N\)
4.  \(\frac{\mu_0L^3}{A}\cdot N^2\)
Subtopic:  Self - Inductance |
 78%
From NCERT
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A current of \(2.5\) A flows through a coil of inductance \(5\) H. The magnetic flux linked with the coil is:
1. \(0.5\) Wb
2. \(12.5\) Wb
3. zero
4. \(2\) Wb
Subtopic:  Self - Inductance |
 85%
From NCERT
NEET - 2013
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The current (\(I\)) in the inductance is varying with time (\(t\)) according to the plot shown in the figure. 

          
Which one of the following is the correct variation of voltage with time in the coil?
1.   2.
3. 4.
Subtopic:  Self - Inductance |
 73%
From NCERT
AIPMT - 2012
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The expression for the magnetic energy stored in a solenoid in terms of magnetic field \(B\), area \(A\) and length \(l\) of the solenoid is:
1. \( \frac{1}{\mu_0}B^2Al\)
2. \( \frac{1}{2\mu_0}B^2Al\)
3. \( \frac{2}{\mu_0}B^2Al\)
4. 
\( \frac{3}{2\mu_0}B^2Al\)

Subtopic:  Self - Inductance |
 82%
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The magnetic potential energy stored in a certain inductor is \(25\) mJ, when the current in the inductor is \(60\) mA. This inductor is of inductance:
1. \(0.138\) H
2. \(138.88\) H
3. \(1.389\) H
4. \(13.89\) H

Subtopic:  Self - Inductance |
 68%
From NCERT
NEET - 2018
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