Q. No.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.
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
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. |
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 |
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 |
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
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
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 |
A small, conducting circular loop is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied, the current induced in the loop is:
| 1. | clockwise |
| 2. | anticlockwise |
| 3. | zero |
| 4. | clockwise or anticlockwise depending on whether the resistance is increased or decreased |
A conducting square loop of side I and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A uniform and constant magnetic field B exists along the perpendicular to the plane of the loop as shown in the figure. The current induced in the loop is
1. Blv/R clockwise
2. Blv/R anticlockwise
3. 2Blv/R anticlockwise
4. zero
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