A solenoid has a core of material with relative permeability The windings of the solenoid are insulated from the core and carry a current of . If the number of turns is per metre, the magnetising field is:
1. | 2. | ||
3. | 4. |
A solenoid has a core of material with relative permeability . The windings of the solenoid are insulated from the core and carry a current of . If the number of turns is per metre, the magnetization, is:
1. | 2. | ||
3. | 4. |
A domain in ferromagnetic iron is in the form of a cube of side length The maximum possible dipole moment is:
[The molecular mass of iron is and its density is Assume that each iron atom has a dipole moment of ]
1.
2.
3.
4.
Figure shows the graph for magnetic hysteresis for a ferromagnetic materail. From the graph, magnetic retentivity for the material is-
1. 2.5 T
2. 1.2 T
3. 1 T
4. 4 T
A solenoid has a core of material with relative permeability The windings of the solenoid are insulated from the core and carry a current of If the number of turns is per metre, the magnetic field intensity is:
1.
2.
3.
4.
In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is and the dip angle is . The magnetic field of the earth at this location is:
1.
2.
3.
4.
The earth’s magnetic field at the equator is approximately 0.4 G. The earth’s dipole moment is:
(Radius of earth, m)
1. A-m2
2. A-m2
3. A-m2
4. A-m2
Which one of the following is correct?
1. | The magnetic field lines also represent the lines of force on a moving charged particle at every point. |
2. | The magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. |
3. | A bar magnet exerts a torque on itself due to its own field. |
4. | The magnetic field arises due to stationary charges. |
Which of the following is the correct representation of magnetic field lines?
1. | (g), (c) | 2. | (d), (f) |
3. | (a), (b) | 4. | (c), (e) |
The figure shows a small magnetized needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetized needle Q. Then:
1. | In configuration, the system is not in equilibrium. |
2. | In configuration, the system is unstable. |
3. | In configuration, the system is stable. |
4. | configuration corresponds to the lowest potential energy among all the configurations shown. |