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 semi-circular 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 \(l\) 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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