A rod of length $$l$$ rotates with a small but 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 centre of the rod and an end is:
1. zero
2. $$\frac{1}{8} \omega {B} l^{2}$$
3. $$\frac{1}{2} \omega {B} l^{2}$$
4. $$B\omega l^2$$

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 |
59%
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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 |
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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 |
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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 |
60%
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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 |
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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 |
83%
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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 |
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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 |
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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 |
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