Q. No.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
A bar magnet is moved along the axis of a copper ring placed far away from the magnet. Looking from the side of the magnet, an anticlockwise current is found to be induced in the ring. Which of the following may be true?
(a) The south pole faces the ring and the magnet moves towards it.
(b) The north pole faces the ring and the magnet moves towards it.
(c) The south pole faces the ring and the magnet moves away from it.
(d) The north pole faces the ring and the magnet moves away from it
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)
A conducting rod is moved with a constant velocity \(v\) in a magnetic field. A potential difference appears across the two ends,
| a. | if \(\overrightarrow v \|\overrightarrow l\) | b. | if \(\overrightarrow v \|\overrightarrow B\) |
| c. | if \(\overrightarrow l \|\overrightarrow B\) | d. | none of these |
Choose the correct option:
| 1. | (a), (b) | 2. | (b), (c) |
| 3. | (d) only | 4. | (a), (d) |
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