| 1. | At magnetic poles, the angle of dip is ? | |
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30º
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zero
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90º
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45º
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Report Question| 2. | Susceptibility is positive and large for a ? | |
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non magnetic substance
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diamagnetic substance
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paramagnetic substance
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ferromagnetic substance
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| 3. | Hysterisis is the phenomenon of lagging of ? | |
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H behind I
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B behind I
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I behind B
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I and B behind H
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| 4. | The hystersis curve is studied generally for ? | |
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diamagnetic materials
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paramagnetic materials
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ferromagnetic materials
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all of the above
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| 5. | Demagnetisation of magnets can be done by ? | |
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heating
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magnetising in the opposite direction
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rough handling
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All of the above
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| 6. | At a point on the right bisector of a magnetic dipole, the magnetic ? | |
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field varies as r^3.
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potential varies as 1/r²
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potential is zero at all points on the right bisector.
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field is perpendicular to the axis of dipole.
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| 7. | The magnetic susceptibility of an ideal diamagnetic substance is ? | |
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0
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+1
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infinity
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-1
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| 8. | The best material for the ore of a transformer is ? | |
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hard steel
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mild steel
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soft iron
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stainless steel
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| 9. | Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magneto static shielding ? | |
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Magnetic field lines can end but conductors cannot end them.
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Electrostatic field lines can end on charges and conductors have free charges.
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Shells of high permeability materials can be used to divert lines of magnetic field from the interior region.
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Lines of magnetic field cannot end on any material and perfect shielding is not possible.
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| 10. | The vertical component of earth’s magnetic field . at a place is ?3 times the horizontal component the value of angle of dip at this place is ? | |
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30°
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45°
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60°
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90°
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