A rod of length I rotates with a small but uniform angular velocity ω about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is

1.   zero

2.    \(\frac{1}{8} \omega \mathrm{B} l^{2}\)

3.    \(\frac{1}{2} \omega \mathrm{B} l^{2}\)

4.   Bωl2

Subtopic:  Motional emf |
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A rod of length \(l\) rotates with a uniform angular velocity \(\omega\) about its perpendicular bisector. A uniform magnetic field \(B\) exists parallel to the axis of rotation. The potential difference between the two ends of the rod is:
1. zero
2. \(\frac{1}{2}Bl\omega ^{2}\)
3. \(Bl\omega ^{2}\)
4. \(2Bl\omega ^{2}\)

Subtopic:  Motional emf |
 60%
From NCERT
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Consider the situation shown in the figure. If the switch is closed and after some time it is opened again, the closed loop will show:
                  

1. an anticlockwise current-pulse.
2. a clockwise current-pulse.
3. an anticlockwise current-pulse and then a clockwise current-pulse.
4. a clockwise current-pulse and then an anticlockwise current-pulse.

Subtopic:  Faraday's Law & Lenz Law |
From NCERT
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Solve the previous question if the closed loop is completely enclosed in the circuit containing the switch.

1.  an anticlockwise current-pulse 

2.  a clockwise current-pulse 

3.  an anticlockwise current-pulse and then a clockwise current-pulse 

4.  a clockwise current-pulse and then an anticlockwise current-pulse.

Previous question: Consider the situation shown in figure. If the switch is closed and after some time it is opened again, the closed loop will show 

                     

Subtopic:  Faraday's Law & Lenz Law |
 58%
From NCERT
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A bar magnet is released from rest along the axis of a very long, vertical copper tube. After some time the magnet:

1. will stop in the tube.
2. will move with almost constant speed.
3. will move with an acceleration \(g\).
4. will oscillate.

Subtopic:  Faraday's Law & Lenz Law |
 59%
From NCERT
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The figure shows a horizontal solenoid connected to a battery and a switch. A copper ring is placed on a frictionless track, the axis of the ring being along the axis of the solenoid. As the switch is closed, the ring will: 
        

1. remain stationary 
2. move towards the solenoid
3. moves away from the solenoid
4. move towards the solenoid or away from it depending on which terminal (positive or negative) of the battery is connected to the left end of the solenoid
Subtopic:  Faraday's Law & Lenz Law |
 51%
From NCERT
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Consider the following statements: 

(A) An emf can be induced by moving a conductor in a magnetic field. 

(B) An emf can be induced by changing the magnetic field. 

1.   Both A and B are true

2.   A is true but B is false

3.   B is true but A is false

4.   Both A and B are false

Subtopic:  Motional emf |
 82%
From NCERT
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Consider the situation shown in the figure. The wire AB is slid on the fixed rails with a constant velocity. If the wire AB is replaced by a semicircular wire, the magnitude of the induced current will

                             

1.  increase

2.  remain the same

3.  decrease 

4.  increase or decrease depending on whether the-semicircle bulges towards the resistance or away from it 

Subtopic:  Motional emf |
 69%
From NCERT
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Figure (a) shows a conducting loop being pulled out of a magnetic field with a speed \(v\). Which of the four plots shown in Figure (b) may represent the power delivered by the pulling agent as a function of the speed \(v\)?
               

1. a
2. b
3. c
4. d

Subtopic:  Faraday's Law & Lenz Law |
From NCERT
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Two circular loops of equal radii are placed coaxially at some separation. The first is cut and a battery is inserted in between to drive a current in it. The current changes slightly because of the variation in resistance with temperature. During this period, the two loops:

1. attract each other
2. repel each other
3. do not exert any force on each other
4. attract or repel each other depending on the sense of the current

Subtopic:  Faraday's Law & Lenz Law |
From NCERT
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