A circular disc of radius 0.2 m is placed in a uniform magnetic field of induction 1π Wbm2 in such a way that its axis makes an angle of 60° with B. The magnetic flux linked to the disc will be:
1. 0.02 Wb
2. 0.06 Wb
3. 0.08 Wb
4. 0.01 Wb

Subtopic:  Magnetic Flux |
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NEET - 2008
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If a current is passed through a circular loop of radius R then magnetic flux through a coplanar square loop of side l as shown in the figure (l<<R) is:

 

1. μ0l2R2l

2. μ0Il22R

3. μ0lπR22l

4. μ0πR2Il

Subtopic:  Magnetic Flux |
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The radius of a loop as shown in the figure is \(10~\mathrm {cm}.\) If the magnetic field is uniform and has a value \(10^{-2}~ T,\) then the flux through the loop will be:
 

1. \(2 \pi \times 10^{-2}Wb\) 2. \(3 \pi \times 10^{-4}Wb\)
3. \(5 \pi \times 10^{-5}Wb\) 4. \(5 \pi \times 10^{-4}Wb\)
Subtopic:  Magnetic Flux |
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What is the dimensional formula of magnetic flux?

1. [M L2 T-2 A-1]

2. [M L1 T-1 A-2]

3. [M L2 T-3 A-1]

4. [M L-2 T-2 A-2]

Subtopic:  Magnetic Flux |
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The magnetic flux linked with a coil varies with time as ϕ = 2t2-6t+5, where ϕ is in weber and t is in seconds. The induced current is zero at:

1. t = 0

2. t = 1.5 s

3. t = 3 s

4. t = 5 s

Subtopic:  Faraday's Law & Lenz Law |
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A coil having number of turns N and cross-sectional area A is rotated in a uniform magnetic field B with an angular velocity ω. The maximum value of the emf induced in it is:

1. NBAω                             

2. NBAω

3. NBAω2                             

4. NBAω2

Subtopic:  Faraday's Law & Lenz Law |
 88%
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The current in a coil varies with time t as I = 3t2+ 2t. If the inductance of coil be 10 mH, the value of induced e.m.f. at \(t=2~\mathrm{s}\) will be:
1. \(0.14~\mathrm{V}\)
2. \(0.12~\mathrm{V}\)
3. \(0.11~\mathrm{V}\)
4. \(0.13~\mathrm{V}\)

Subtopic:  Faraday's Law & Lenz Law |
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A bar magnet is released along the vertical axis of the conducting coil. The acceleration of the bar magnet is:

1. greater than g. 2. less than g.
3. equal to g. 4. zero.
Subtopic:  Faraday's Law & Lenz Law |
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A coil having an area A0 is placed in a magnetic field which changes from B0 to 4B0 in time interval t. The average EMF induced in the coil will be:

1. 3A0B0t

2. 4A0B0t

3. 3B0A0t

4. 4B0A0t

Subtopic:  Faraday's Law & Lenz Law |
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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

1. Twice per revolution 2. Four times per revolution
3. Six times per revolution 4. Once per revolution
Subtopic:  Faraday's Law & Lenz Law |
 73%
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AIPMT - 2013
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