Q. No.Two solenoids have identical geometrical construction but one is made of thick wire and the other of thin wire. Which of the following quantities are different for the two solenoids?
(a) self-inductance
(b) rate of Joule heating if the same current goes through them
(c) magnetic field energy if the same current goes through them
(d) the time constant if one solenoid is connected to one battery and the other is connected to another battery
Choose the correct option
1. (a), (b)
2. (b), (d)
3. (c), (d)
4. (a), (d)
(b) rate of Joule heating if the same current goes through them
(c) magnetic field energy if the same current goes through them
(d) the time constant if one solenoid is connected to one battery and the other is connected to another battery
An LR circuit with a battery is connected at t = 0. Which of the following quantities is not zero just after the connection?
(a) current in the circuit
(b) magnetic field energy in the inductor
(c) power delivered by the battery
(d) emf induced in the inductor
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (a)
4. (d) only
A rod AB moves with a uniform velocity v in a uniform magnetic field as shown in the figure.
(a) The rod becomes electrically charged.
(b) The end A becomes positively charged.
(c) The end B becomes positively charged.
(d) The rod becomes hot because of Joule heating.
Choose the correct option
1. (a), (b)
2. (b) only
3. (c), (d)
4. (a), (d)
\(L,\) \(C\) and \(R\) represent the physical quantities inductance, capacitance and resistance respectively. Which of the following combinations have dimensions of frequency?
(a) \(1 \over RC\)
(b) \(R \over L\)
(c) \(\frac{1}{\sqrt{\mathrm{LC}}}\)
(d) \(C \over L\)
Choose the correct option:
| 1. | (a), (b), (c) |
| 2. | (d), (c), (a) |
| 3. | (c), (d), (b) |
| 4. | (a), (d), (b) |
The switches in figure (a) and (b) are closed at t = 0 and reopened after a long time at t = t0
| 1. | The charge on C just after t = 0 is εC. |
| 2. | The charge on C long after t = 0 is εC. |
| 3. | The current in L just before t = t0 is ε/R. |
| 4. | The current in L long after t = t0 is ε/R. |
Choose the correct option:
| 1. | (a), (b) |
| 2. | (b), (c) |
| 3. | (c), (d) |
| 4. | (a), (d) |
A constant current \(i\) is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the solenoid along its axis?
| a. | magnetic field at the centre |
| b. | magnetic flux linked with the solenoid |
| c. | self-inductance of the solenoid |
| d. | rate of Joule heating |
Choose the correct option:
1. (a), (b), (c)
2. (b), (c)
3. (c), (d)
4. (a), (b), (d)
A metal sheet is placed in front of a strong magnetic pole. A force is needed to:
| (a) | hold the sheet there if the metal is magnetic. |
| (b) | hold the sheet there if the metal is nonmagnetic. |
| (c) | move the sheet away from the pole with uniform velocity if the metal is magnetic. |
| (d) | move the sheet away from the pole with uniform velocity if the metal is nonmagnetic. |
Neglect any effect of paramagnetism, diamagnetism and gravity.
Choose the correct option.
| 1. | (a), (c), (d) |
| 2. | (b), (c), (a) |
| 3. | (c), (d), (a) |
| 4. | (a), (d), (c) |
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if
| (a) | it is translated |
| (b) | it is rotated about its axis |
| (c) | it is rotated about a diameter |
| (d) | it is deformed |
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), only
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) |
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)
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