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