Answer the following questions regarding earth’s The earth’s field,it is claimed, roughly approximates the field due to a dipole of magnetic moment `8xx 10^22J//T` located at its centre. Check the order of magnitude of this number in some way.

Answer the following questions regarding earth’s magnetism:In which direction would a compass free to move inthe verticalplane point to, if located right on the geomagnetic north or south pole?

Answer the following questions regarding earth’s magnetism:Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented in different directions. How is such a thing possible at all?

Answer the following questions regarding earth’s magnetism:The angle- of dip at a location in southern India Is about 18^@ . Would you expect a greater or smaller dip angle in Britain?

Answer the following questions regarding earth's magnetism: If you make a map of magnetic field lines at Melbourne in Australia, would the lines seen to go into the ground or come out of the ground?

Answer the following questions regarding earth’s magnetism:If you made a map of magnetic field ines at Melbourne in Australia, would the lines seem to go Into the ground or come out of the ground?

At a certain location In Africa, a compass points 12^@ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points 60^@ above the horizontal. The horizontal component of the earth’s field is measured to be 0.16 G. Specify the direction and magnitude of the earth’s field at the location.

A 100 turn closely wound circular cell of radius 10 cm carries a current of 3.2A (a) what is the field at the centre of the coil? (b) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^(o) under the influence of the magnetic field (c) What are the magnitudes of the torques on the coil in the initial and final position? (d) What is the angular speed acquired by the coil when it has rotated by 90^(o) ? The moment of inertia of the coil is 0.1 kg m^(2) .