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: Â Magnetic Flux |
Â 66%
From NCERT
NEET - 2022
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In a coil of resistance $$10$$ $$\Omega$$, the induced current developed by changing magnetic flux through it is shown in the figure as a function of time. The magnitude of change in flux through the coil in Weber is:

1. $$2$$
2. $$6$$
3. $$4$$
4. $$8$$

Subtopic: Â Magnetic Flux |
Â 67%
From NCERT
AIPMT - 2012
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A coil of resistance $$400~\Omega$$ is placed in a magnetic field. The magnetic flux $$\phi~\text{(Wb)}$$ linked with the coil varies with time $$t~\text{(s)}$$ as $$\phi=50t^{2}+4.$$ The current in the coil at $$t=2~\text{s}$$ is:
1. $$0.5~\text{A}$$
2. $$0.1~\text{A}$$
3. $$2~\text{A}$$
4. $$1~\text{A}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 88%
From NCERT
AIPMT - 2012
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A circular loop of radius $$\mathrm{R}$$, enters a region of uniform magnetic field $$\mathrm{B}$$ as shown in the diagram. The field $$(\mathrm{B})$$ is perpendicular to the plane of the loop while the velocity of the loop,$$\mathrm{v}$$, is along its plane. The induced EMF:

 1 increases continuously. 2 decreases continuously. 3 first increases and then decreases. 4 remains constant throughout.
Subtopic: Â Faraday's Law & Lenz Law |
Â 70%
From NCERT
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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: Â Faraday's Law & Lenz Law |
Â 55%
From NCERT
NEET - 2022
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The magnetic field, through a closed loop of conducting wire covering an area of $$100$$ cm2, is $$5\times10^{-2}$$ T and it is uniform and normal to the area. If the field is switched off in a time of $$10$$ ms, the average emf induced is:
1. $$5$$ V
2. $$0.5$$ V
3. $$0.05$$ V
4. $$5\times10^{-4}$$ V
Subtopic: Â Faraday's Law & Lenz Law |
Â 78%
From NCERT
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The figure shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normally to the plane of the loop away from the reader. Then:

 1 for the rectangular loop abcd, the induced current is clockwise. 2 for the triangular loop abc, the induced current is clockwise. 3 for the irregularly shaped loop abcd, the induced current is anti-clockwise. 4 none of these.

Subtopic: Â Faraday's Law & Lenz Law |
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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. $$\frac{\pi}{2}~\mu\text{V}$$
4. $$2 ~\mu \text{V}$$

Subtopic: Â Faraday's Law & Lenz Law |
Â 76%
From NCERT
AIPMT - 2010
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A square wire loop of resistance $$0.5$$ $$\Omega$$/m, having a side $$10$$ cm and made of $$100$$ turns is suddenly flipped in a magnetic field $$B,$$ which is perpendicular to the plane of the loop. A charge of $$2\times10^{-4}$$ C passes through the loop. The magnetic field $$B$$ has the magnitude of:
1. $$2\times10^{-6}$$ T
2. $$4\times10^{-6}$$ T
3. $$2\times10^{-3}$$ T
4. $$4\times10^{-3}$$ T
Subtopic: Â Magnetic Flux |
From NCERT
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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is:
 1 twice per revolution. 2 four times per revolution. 3 six times per revolution. 4 once per revolution.

Subtopic: Â Faraday's Law & Lenz Law |
Â 74%
From NCERT
AIPMT - 2013
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