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Earn 100
The magnetic field lines due to a bar magnet are correctly shown in
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Important Questions on Magnetism and Matter
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IMPORTANT
A thin rectangular magnet, suspended freely, has a period of oscillation equal to . Now, it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If it's period of oscillation is , then the ratio is
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A short magnet produces a deflection of , when placed at certain distance, in position of magnetometer. If another short magnet of double the length and thrice the pole strength, is placed at the same distance, in position of the magnetometer, the deflection produced will be
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Two bar magnets of the same mass, same length and breadth but having magnetic moments and , are joined together, pole to pole, and suspended by a string. The time period of assembly in a magnetic field is . If now, the polarity of one of the magnets is reversed and combination is again made to oscillate in the same field, the time period of oscillation is
MEDIUM
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The time period of oscillation of a magnet in a vibration magnetometer is . The time period of oscillation of another magnet similar in size, shape and mass but having times magnetic moment than that of the first magnet oscillating at the same place will be
EASY
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Two identical thin bar magnets, each of length and pole strength , are placed at right angles to each other, with north pole of one touching the south pole of the other. The magnitude of magnetic moment of the system is
MEDIUM
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A vibration magnetometer consists of two identical bar magnets, placed one over the other such that, they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is . If one of the magnets is removed and the other magnet oscillates in the same field, then the time period (in ) is
MEDIUM
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The length of a magnet is large compared to it's width and breadth. The time period of it's oscillation in a vibration magnetometer is . The magnet is cut along its length into three equal parts and these parts are then placed on each other with their like poles together. The time period of this combination will be
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A small coil with turns is mounted on one end of a balance beam and introduced between the poles of an elctromagnet as shown in the figure. The cross sectional area of coil is , length of arm of the balance beam is . When there is no current in the coil the balance is in equilibrium. On passing a current through the coil the equilibrium is restored by putting the additional counter weight of mass on the balance pan. Find the magnetic induction at the spot where coil is located.
