1 A bar magnet of magnetic dipole moment 10 Am is in stable equilibrium The work done to rotate the magnet through 60 in a

Question

1 A bar magnet of magnetic dipole moment 10 Am is in stable equilibrium The work done to rotate the magnet through 60 in a magnetic field of 0 2T is 1 2 2J 3 1J 4 43 2 Time period of a thin bar magnet in uniform magnetic field is T Now the magnet is cut into two identical halves so that its length becomes half and time period of each small magnet in the same magnetic field is T The ratio of T and T is 1 2 2 2 3 2 2 3 If and are the apparent angles of dip observed elquestionper 4 4 1 in two vertical planes at right angles to each other and the true angle of dip is at that place then 4 1 tan tan tan 2 2 tan cot cot 02 3 cot2 cot cot 2 4 cos cos cos 2 Isoclinic lines are 1 Line joining places of equal angle of dip 2 Line joining places of zero angle of dip Telegr 3 Line joining places of equal angle of declination 4 Line joining places of zero angle of declination 5 Magnetic field inside substance is B and that in free space is Bo then for B Bo the substance is 1 a paramagnetic 2 a diamagnetic 3 a ferromagnetic 4 1 and 2 both are possible 3 Magnetic susceptibility of a paramagnetic substance is plotted against absolute temperature T The correct graph is 1 8 2 A 4 7 A short bar magnet has point A and B along axis at a distance of 24 cm and 48 cm from cen on the opposite sides Ratio of magnitude magnetic fields at these points will be 1 2 2 8 3 3 A magnet when suspended at an angle of 30 magnetic meridian the dip needle makes an ang 45 with horizontal The dip angle measured magnetic meridian will be 1 tan 2 tan 3 3 2 3 tan 2 4 tan 1 2

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