Why does the magnetisation of a paramagnetic salt increase on cooling? How does a diamagnetic substance respond to similar temperature changes?
14. At a place horizontal and vertical components of earth's magnetic field are as follows
BH = 1 G 10o west of north
BV = 1 G vertically downward
Then dip angle and declination are respectively
(1) 0o, 10o W (2) 45o, 10o E
(3) 45o, 10o W (4) 10o W, 45o
4. The component of the magnetic field along the line OP at the point P due to the bar magnet of magnetic moment 1.732 Am2 is
Two similar bars, made from two different materials P and Q are placed, one by one, in a non-uniform magnetic field. It is observed that bar P tends to move from the weak to strong field region bar Q tends to move from the strong to weak field region. What is the nature of the magnetic materials used for these two bars Show, with the help of a diagram, the behavior of the field lines due to an external magnetic field near each of these two bars.
Q9. A bar magnet with poles 25 cm apart and of polc strength 14.4 Am rests with its centre on a frictionless pivot. It is held in equilibrium at 60° to a uniform magnetic field of induction 0.25 T by applying a force F at right angles to its axis, 12 cm from its pivot. Calculate F. What will happen if the force F is removed?
Q7. A short bar magnet of magnetic moment 5.25 × 10–2 JT–1is placed with its axis perpendicular to the earth's field direction. At what distance from the centre of the magnet on (i) its normal bisector (ii) its axis, is the resultant field inclined at 45° with the earth's field. Magnitude of the earth's field at the place is given to be 0.42 G. Ignore the length of magnet in comparison to the distance involved.
Q.4. A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth's magnetic field at the place is 0.36 G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null-points (i.e., 14 cm) from the centre of the magnet ?
Why does the magnetisation of a paramagnetic salt increase on cooling? How does a diamagnetic substance respond to similar temperature changes?
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Why does the magnetisation of a paramagnetic salt increase on cooling? How does a diamagnetic substance respond to similar temperature changes?
Q.8. Five masses 1 g, 2 g, 3 g, 4 g and 5 g are suspended serially at a separation of 25 cm from a weightless metre rod. Where should the rod be supported so that it remains horizontal?
[66.66 cm from the 1 g mass]