Answer the following questions regarding earth's magnetism.
a. A vector needs three quantities conventionally used to specify the earth's magnetic field.
b. The angle of dip at a location in southern India is about `18^@` . Would you expect a greater or smaller dip angle in Britain ?
c. If you made a map of magnetic field lines at Melboune in Australia, would the lines seem to go into the groung or come out of the ground ?
d. In which direction would a compass free to move in the vertical plane point to , if located right on the geomagnetic north or south pole ?
e. the earth' s field, it is claimed roughly approximates the field due to a dipole of magnetic moment `8 xx10^(22)JT^(-1)` located at its centre. Check the order of magnitude of this number in some way.
f. 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 ?