# 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 current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be:

 1 2 3 4
Subtopic: Â Faraday's Law & Lenz Law |
Â 69%
From NCERT
AIPMT - 2011
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A conducting circular loop is placed in a uniform magnetic field, $$B=0.025~\text{T}$$ with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of $$1~\text{mm s}^{-1}$$. The induced emf, when the radius is $$2~\text{cm}$$, is:
1. $$2\pi ~\mu\text{V}$$
2. $$\pi ~\mu\text{V}$$
3. $$\dfrac{\pi}{2}~\mu\text{V}$$
4. $$2 ~\mu \text{V}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 76%
From NCERT
AIPMT - 2010
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A conducting circular loop is placed in a uniform magnetic field of $$0.04$$ T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at a rate of $$2$$ mm/s. The induced emf in the loop when the radius is $$2$$ cm is:
1. $$3.2\pi ~\mu \text{V}$$

2. $$4.8\pi ~\mu\text{V}$$

3. $$0.8\pi ~\mu \text{V}$$

4. $$1.6\pi ~\mu \text{V}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 69%
From NCERT
AIPMT - 2009
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A rectangular, a square, a circular, and an elliptical loop, all in the $$(x\text-y)$$ plane, are moving out of a uniform magnetic field with a constant velocity, $$\vec{v}= v\hat{i}.$$ The magnetic field is directed along the negative $$z\text-$$axis direction. The induced emf, during the passage of these loops out of the field region, will not remain constant for:
 1 the rectangular, circular, and elliptical loops. 2 the circular and the elliptical loops. 3 only the elliptical loop. 4 any of the four loops.
Subtopic: Â Motional emf |
Â 72%
From NCERT
AIPMT - 2009
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A long solenoid has $$500$$ turns. When a current of $$2$$ A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $$4\times 10^{-3}$$ Wb. The self-inductance of the solenoid is:
1. $$2.5$$ H
2. $$2.0$$ H
3. $$1.0$$ H
4. $$4.0$$ H

Subtopic: Â Self - Inductance |
Â 79%
From NCERT
AIPMT - 2008
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A circular disc of radius $$0.2~\text{m}$$ is placed in a uniform magnetic field of induction $$\frac{1}{\pi}~\text{Wb/m}^{2}$$ in such a way that its axis makes an angle of $$60^{\circ}$$ with $$\vec{B}.$$ The magnetic flux linked with the disc is:
1. $$0.02~\text{Wb}$$
2. $$0.06~\text{Wb}$$
3. $$0.08~\text{Wb}$$
4. $$0.01~\text{Wb}$$
Subtopic: Â Magnetic Flux |
Â 84%
From NCERT
AIPMT - 2008
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The primary and secondary coils of a transformer have $$50$$ and $$1500$$ turns respectively. If the magnetic flux $$\phi$$ linked with the primary coil is given by $$\phi=\phi_0+4t,$$ where $$\phi$$ is in Weber, $$t$$ is time in seconds, and $$\phi_0$$  is a constant, the output voltage across the secondary coil is:
1. $$90~\mathrm{V}$$
2. $$120~\mathrm{V}$$
3. $$220~\mathrm{V}$$
4. $$30~\mathrm{V}$$

Subtopic: Â Magnetic Flux |
Â 80%
From NCERT
AIPMT - 2007
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Two coils of self-inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

1. 10 mH

2. 6 mH

3. 4 mH

4. 16 mH

Subtopic: Â Mutual Inductance |
Â 73%
From NCERT
AIPMT - 2006
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In which of the following devices, the eddy current effect is not used?

 1 electric heater 2 induction furnace 3 magnetic braking in train 4 electromagnet
Subtopic: Â Eddy Current |
Â 56%
From NCERT
NEET - 2019
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