The magnetic energy stored in an inductor of inductance $$4~\mathrm{\mu H}$$ carrying a current of $$2~\text{A}$$ is:
1. $$8~\mathrm{\mu J}$$
2. $$4~\mathrm{\mu J}$$
3. $$4~\mathrm{mJ}$$
4. $$8~\mathrm{mJ}$$
Subtopic:  Self - Inductance |
73%
From NCERT
NEET - 2023
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An emf is generated by an ac generator having $$100$$ turn coil, of loop area $$1$$ m2. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of $$0.05$$ T perpendicular to the axis of rotation of the coil. The maximum value of emf is:
1. $$3.14$$ V
2. $$31.4$$ V
3. $$62.8$$ V
4. $$6.28$$ V
Subtopic:  Motional emf |
71%
From NCERT
NEET - 2023
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A square loop of side $$1$$ m and resistance $$1$$ $$\Omega$$ is placed in a magnetic field of $$0.5$$ T. If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is:
 1 $$0$$ 2 $$2$$ weber 3 $$0.5$$ weber 4 $$1$$ weber
Subtopic:  Magnetic Flux |
66%
From NCERT
NEET - 2022
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A big circular coil of $$1000$$ turns and average radius $$10~\text{m}$$  is rotating about its horizontal diameter at $$2~\text{rad s}^{-1}$$. If the vertical component of earth's magnetic field at that place is $$2\times 10^{-5}~\text{T}$$ and electrical resistance of the coil is $$12.56~\Omega,$$ then the maximum induced current in the coil will be:
1. $$2~\text{A}$$
2. $$0.25~\text{A}$$
3. $$1.5~\text{A}$$
4. $$1~\text{A}$$
Subtopic:  Faraday's Law & Lenz Law |
55%
From NCERT
NEET - 2022
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The current in an inductor of self-inductance $$4~\text{H}$$ changes from $$4~ \text{A}$$ to $$2~\text{A}$$ in $$1~ \text s$$. The emf induced in the coil is:
1. $$-2~\text{V}$$
2. $$2~\text{V}$$
3. $$-4~\text{V}$$
4. $$8~\text{V}$$

Subtopic:  Self - Inductance |
83%
From NCERT
NEET - 2022
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The dimensions of mutual inductance $$(M)$$ are:
1. $$\left[M^2LT^{-2}A^{-2}\right]$$
2. $$\left[MLT^{-2}A^{2}\right]$$
3. $$\left[M^{2}L^{2}T^{-2}A^{2}\right]$$
4. $$\left[ML^{2}T^{-2}A^{-2}\right]$$

Subtopic:  Mutual Inductance |
72%
From NCERT
NEET - 2022
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An inductor coil of self-inductance $$10~\mathrm H$$ carries a current of $$1~\mathrm A$$ . The magnetic field energy stored in the coil is:

 1 $$10~\mathrm J$$ 2 $$2.5~\mathrm J$$ 3 $$20~\mathrm J$$ 4 $$5~\mathrm J$$
Subtopic:  Self - Inductance |
83%
From NCERT
NEET - 2022
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The magnetic flux linked to a circular coil of radius $$R$$ is;
$$\phi=2t^3+4t^2+2t+5$$ Wb.
The magnitude of induced emf in the coil at $$t=5$$ s is:
1. $$108$$ V
2. $$197$$ V
3. $$150$$ V
4. $$192$$ V
Subtopic:  Faraday's Law & Lenz Law |
85%
From NCERT
NEET - 2022
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Two conducting circular loops of radii $$R_1$$$\mathrm{and}$$$R_2$$ are placed in the same plane with their centres coinciding. If $$R_1>>R_2$$ the mutual inductance $$M$$ between them will be directly proportional to:
1. $$\frac{R^2_1}{R_2}$$
2. $$\frac{R^2_2}{R_1}$$
3. $$\frac{R_1}{R_2}$$
4. $$\frac{R_2}{R_1}$$

Subtopic:  Mutual Inductance |
59%
From NCERT
NEET - 2021
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The magnetic flux linked with a coil (in Wb) is given by the equation $$\phi=5 t^2+3 t+60$$. The magnitude of induced emf in the coil at $$t=4$$ s  will be:
1. $$33$$ V
2. $$43$$ V
3. $$108$$ V
4. $$10$$ V

Subtopic:  Faraday's Law & Lenz Law |
87%
From NCERT
NEET - 2020
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