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How will a dia-, para- and a ferromagnetic material behave when kept in a non-uniform external magnetic field ? Give two examples of each of these materials. Name two main characteristics of a ferromagnetic material which help us to decide its suitability for making an electromagnet. Which of these two characteristics should have high or low values for each of these two types of magnets ?
Important Questions on Matter and Magnetism
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An iron rod of cross sectional area 4 cm2 is placed with its length parallel to a magnetising field 1600 Am–1. The flux through the rod is 4 × 10–4 weber. Find out permeability of the material of the rod ?
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The unit of magnetic moment is -
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Magnetic field lines produced by a bar magnet, cuts each other :-
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If the angle of dip at two places are 30º and 45º respectively, then the ratio of horizontal component of earth’s magnetic field at two places assuming magnitude of total magnetic field of earth is same, will be :-
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Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is T1. Now the polarity of one of the magnet is reversed then time period of oscillation is T2, then :-
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Magnetic field of earth is 0.3 gauss. A magnet oscillating with rate of 5 oscillation/min. How much the magnetic field of earth is increased, so the number of oscillations become 10 per min :-
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A magnet makes oscillations per minute at a place having magnetic field of . At another place, it takes to complete one vibration. The value of earth’s horizontal field at that place is :-
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The magnetic needle of tangent galvanometer is deflected at an angle due to a magnet. The horizontal component of earth's magnetic field is along the plane of the coil. Then the magnetic intensity will be
