HARD
NEET
IMPORTANT
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A magnetic needle lying parallel to a magnetic field requires unit(s) of work to turn it through . The torque needed to maintain the needle in this position will be,
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Important Questions on Matter and Magnetism
MEDIUM
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IMPORTANT
Two tangent galvanometers and connected in series to a d. c. source have their number of turns in the ratio and diameters in the ratio of their coils which is correct for reduction factor and deflection of both galvanometers.
MEDIUM
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IMPORTANT
The time period of a freely suspended bar magnet does not depends on :-
MEDIUM
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IMPORTANT
For a vibration magnetometer, the time period of freely suspended bar magnet can be reduced by:-
HARD
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IMPORTANT
A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is and 15 oscillations per minute at a place where dip angle is . The ratio of the total earth's magnetic field at the two places is -
EASY
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IMPORTANT
Magnetic moments of two identical bar magnets are and respectively. Both are combined in such a way that their similar poles are together. The time period in this situation is . If polarity of one of the magnet is reversed then its period becomes then :-
EASY
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IMPORTANT
Time period of thin bar magnet of vibration magnetometer is . If it cuts into two equal parts in then the time period of each part fashions.
Along or parallel to its length.
Perpendicular to its length.
MEDIUM
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IMPORTANT
The ratio of the magnetic field due to a small bar magnet in end on position to broad side on position is :-
MEDIUM
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IMPORTANT
The magnetic field at a point X on the axis of a small bar magnet is equal to the field at a point Y on the equator of the same magnet. The ratio of the distances of point X and Y from the centre of the magnet is :-
