The magnetic energy stored in an inductor of inductance $$4~\mathrm{\mu H}$$ carrying a current of $$2$$ A is:
1. $$8~\mathrm{\mu J}$$
2. $$4~\mathrm{\mu J}$$
3. $$4~\mathrm{mJ}$$
4. $$8~\mathrm{mJ}$$
Subtopic:  Self - Inductance |
70%
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 |
67%
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 |
63%
From NCERT
NEET - 2022
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A big circular coil of $$1000$$ turns and average radius $$10$$ m is rotating about its horizontal diameter at $$2$$ rad s-1. If the vertical component of earth's magnetic field at that place is $$2\times 10^{-5}$$ T and electrical resistance of the coil is $$12.56~\Omega,$$ then the maximum induced current in the coil will be:
1.  $$2$$ A
2.  $$0.25$$ A
3.  $$1.5$$ A
4.  $$1$$ A
Subtopic:  Faraday's Law & Lenz Law |
From NCERT
NEET - 2022
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The current in an inductor of self-inductance $$4$$ H changes from $$4$$ A to $$2$$ A in $$1$$ s. The e.m.f. induced in the coil is:
1. $$-2$$ V
2. $$2$$  V
3. $$-4$$ V
4. $$8$$ V

Subtopic:  Self - Inductance |
80%
From NCERT
NEET - 2022
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The dimensions of mutual inductance (M) are:
1. [M2LT-2A-2]
2. [MLT-2A2]
3. [M2L2T-2A2]
4. [ML2T-2A-2]

Subtopic:  Mutual Inductance |
69%
From NCERT
NEET - 2022
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An inductor coil of self-inductance $$10$$ H carries a current of $$1$$ A. The magnetic field energy stored in the coil is:
1. $$10$$ J
2. $$2.5$$ J
3. $$20$$ J
4. $$5$$ J

Subtopic:  Self - Inductance |
80%
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:  Magnetic Flux |
81%
From NCERT
NEET - 2022
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Two conducting circular loops of radii  are placed in the same plane with their centres coinciding. If ${\mathrm{R}}_{1}>>{\mathrm{R}}_{2}$, the mutual inductance M between them will be directly proportional to:

1. $\frac{{\mathrm{R}}_{1}^{2}}{{\mathrm{R}}_{2}}$

2. $\frac{{\mathrm{R}}_{2}^{2}}{{\mathrm{R}}_{1}}$

3. $\frac{{\mathrm{R}}_{1}}{{\mathrm{R}}_{2}}$

4. $\frac{{\mathrm{R}}_{2}}{{\mathrm{R}}_{1}}$

Subtopic:  Mutual Inductance |
57%
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 |
86%
From NCERT
NEET - 2020
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