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The volume susceptibility of a magnetic material is 30 × 10–4. Its; relative permeability will be :-
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Important Questions on Matter and Magnetism
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The magnetic moment of a magnet of mass 75 gm is 9 × 10–7 A-m2. If the density of the material of magnet is 7.5 × 103 kg/m3 then intensity of magnetisation will be :-
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The area of hysteresis loop of a material is equivalent to 250 Joule/m3. When 10 kg material is magnetised by an alternating field of 50Hz then energy lost in one hour will be if the density of material is 7.5 gm/cm3.
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The coercivity of a bar magnet is 100A/m. It is to be demagnetised by placing it inside a solenoid of length 100 cm and number of turns 50. The current flowing the solenoid will be :
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Which of the following conclusions can be drawn from the result?
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A straight wire carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is (consider earth field) :-
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A circular coil of radius 20 cm and 20 turns of wire is mounted vertically with its plane in magnetic meridian. A small magnetic needle is placed at the centre of the coil and it is deflected through 45°, when a current is passed through the coil. When horizontal component of earth's field is 0.34 ×10–4T, the current in coil is :-
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Which of the following is true :-
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A superconductor exhibits perfect :
