The mutual inductance of a pair of coils is 2H. If the current  of the coil changes from 10A to zero in 0.1s, the emf induced in the other coil is – 

1.  2 V                     

2.  20 V 

3.  0.2 V                 

4.  200 V

Subtopic:  Mutual Inductance |
 87%
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A current-carrying wire is placed below a coil in its plane, with current flowing as shown.

If the current increases –

     

1. no current will be induced in the coil 

2. an anticlockwise current will be induced in the coil 

3. a clockwise current will be induced in the coil 

4. the current induced in the coil will be first anticlockwise and then clockwise

Subtopic:  Faraday's Law & Lenz Law |
 61%
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The back emf induced in a coil, when current changes from 1 ampere to zero in one milli-second, is 4 volts. The self-inductance of the coil is:

1. 1 H                  

2. 4 H

3. 103 H              

4. 4 × 103 H

Subtopic:  Self - Inductance |
 89%
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Average energy stored in a pure inductance L when a current i flows through it, is

1.  Li2                           

2.  2Li2

3.  Li2/4                       

4.  Li2/2

Subtopic:  Self - Inductance |
 86%
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A small magnet is along the axis of a coil and its distance from the coil is 80 cm. In this position the flux linked with the coil are 4 × 105 weber turns. If the coil is displaced 40 cm towards the magnet in 0.08 second, then the induced emf produced in the coil will be -

1.  0.5 mV                       

2.  1 mV 

3.  7 mV                           

4.  3.5 mV

Subtopic:  Faraday's Law & Lenz Law |
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A wooden stick of length 3l is rotated about an end with constant angular velocity ω in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is –

      

1. 9l22                           

2. 4l22

3. 5l22                           

4. l22

Subtopic:  Motional emf |
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A train is moving at a rate of 72 km/hr on a horizontal plane. If the earth's horizontal component of magnetic field is 0.345 A/m and the angle of dip is 30°, then the potential difference across the two ends of a compartment of length 1.7 m will be-

1.  1.7 V                             

2.  853×10-4 V

3.  85×10-4 V                 

4.  850 μ V

Subtopic:  Motional emf |
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An air-plane with 20m wing spread is flying at 250 ms-1 straight south parallel to the earth’s surface. The earth’s magnetic field has a horizontal component of 2 × 105 Wb m2 and the dip angle is 60º. Calculate the induced emf between the plane tips is:

1.  0.174 V                 

2.  0.173 V 

3.  1.173 V                 

4.  0.163 V

Subtopic:  Motional emf |
 77%
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A wire of fixed lengths is wound on a solenoid of length l and radius r. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length l/2 and radius r/2, then the self inductance will be –

1.  2L                     

2.  L 

3.  4L                     

4.  8L

Subtopic:  Self - Inductance |
 52%
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A wire in the form of a circular loop of radius 10 cm lies in a plane normal to a magnetic field of 100 T. If this wire is pulled to take a square shape in the same plane in 0.1 s, average induced emf in the loop is: 

1.  6.70 volt                   

2.  5.80 volt 

3.  6.75 volt                   

4.  5.75 volt

Subtopic:  Faraday's Law & Lenz Law |
 60%
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