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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material is denoted by μd, μp and μf respectively, then

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Important Questions on Magnetic Effects of Current and Magnetism

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A bar magnet of dipole moment 104 JT-1 is free to rotate in a horizontal plane. A horizontal magnetic field 4×10-5 T exists in space. Find the work done in rotating the magnet slowly from a direction parallel to the field to a direction of 60° with the field.
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The value of earth magnetic field BH=0.3 G. In this magnetic field a magnet is oscillating with 5 oscillations min-1. To increase the oscillation of magnet upto 10 oscillations min-1, the value of earth magnetic field is increased by 
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A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 s. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 s. Then the angle of dip is
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The materials suitable for making electromagnets should have
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The ratio of intensity of magnetization and magnetizing field is called
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Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
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If a diamagnetic substance is brought near north or south pole of a bar magnet, it is,
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If X is the magnetic susceptibility and T is the Curie's temperature. Then, the correct curve between X and 1T for a paramagnetic material is: