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%
From NCERT
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. 2B0L2 Wb
2. 3B0L2 Wb
3. 4B0L2 Wb
4. 29B0L2 Wb

Subtopic:  Magnetic Flux |
 72%
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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.
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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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