# 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 |
65%
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NEET - 2022
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

 Assertion (A): The bar magnet falling vertically along the axis of the horizontal coil will be having acceleration less than $$g.$$ Reason (R): Clockwise current induced in the coil.

In the light of the above statements choose the correct answer from the options given below:

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Faraday's Law & Lenz Law |
76%
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Given below are two statements:
 Statement I: A steady magnetic field can be produced by a steady current. Statement II: A steady current can be produced in a circuit by a changing magnetic field.

 1 Statement I is incorrect and Statement II is correct. 2 Both Statement I and Statement II are correct. 3 Both Statement I and Statement II are incorrect. 4 Statement I is correct and Statement II is incorrect.
Subtopic:  Faraday's Law & Lenz Law |
52%
From NCERT
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In the given magnetic flux versus time graph, the magnitude of emf induced in the loop at $$t=3$$ s is:

1. $$5$$
2. $$4$$
3. $$3$$
4. zero
Subtopic:  Faraday's Law & Lenz Law |
74%
From NCERT
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For a coil having$$L=2~\mathrm{mh},$$ the current flow through it is $$I=t^2e^{-t}.$$ The time at which emf becomes zero is:
1. 2 s
2. 1 s
3. 4 s
4. 3 s

Subtopic:  Self - Inductance |
61%
From NCERT
AIPMT - 2001
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A square of side L meters lies in the XY-plane in a region where the magnetic field is given by $$\vec{B}=B_{0}\left ( 2\hat{i} +3\hat{j}+4\hat{k}\right )~T$$ where $$B_{0}$$ is constant. The magnitude of flux passing through the square will be:

1.
2.
3.
4.

Subtopic:  Magnetic Flux |
72%
From NCERT
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The adjoining figure shows two different arrangements in which two square wireframes are placed in a uniform magnetic field B decreasing with time.

The direction of the induced current I in the figure is:

 1 From a to b and from c to d 2 From a to b and from f to e 3 From b to a and from d to c 4 From b to a and from e to f

Subtopic:  Faraday's Law & Lenz Law |
66%
From NCERT
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Two identical conductors P and Q are placed on two frictionless (conducting) rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction as shown in the figure with a constant speed, then rod Q:

 1 will be attracted toward P 2 will be repelled away from P 3 will remain stationary 4 maybe repelled or attracted towards P

Subtopic:  Motional emf |
From NCERT
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Two coaxial coils are very close to each other and their mutual inductance is 5 mH. If a current 50 sin 500t is passed in one of the coils, then the peak value of induced e.m.f. in the secondary coil will be:

 1 5000 V 2 500 V 3 150 V 4 125 V
Subtopic:  Mutual Inductance |
75%
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With the decrease of current in the primary coil from 2 A to zero in 0.01 s, the e.m.f. generated in the secondary coil is $$1000~\mathrm{V}$$. The mutual inductance of the two coils is:

1. 1.25 H

2. 2.50 H

3. 5.00 H

4. 10.00 H

Subtopic:  Mutual Inductance |
88%
From NCERT
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