Answer the question 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 If a map of magnetic field lines is prepared at Melbourne in Australia , would the lines seem to go into the ground or come out of the ground .

Define angel of dip at a place. What will be the value of the angle at the poles and the equator of the earth? Aat what place on the earth's surface will the horozontal component of the eath's magnetic field and is verticle component ne equal?

At tow places , the angels oa dip are 30^(@) N and 30^(@) S and the earth 's magnetic filed is 0.42 Oe . Determine the horizontal and the vertical components of earth's magnetic field at these two places and also indicate their directions with the help of a diagram .

Define neutral point. How will you find the magnetic moment of a bar magnet by locating its neutral point, when magnet is placed with its north pole towards (a) north pole of the earth and (b) south pole of the earth?

A metal rod PQ is resting on the rails A'B' and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutually perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mOmega . Assume the field to be uniform. How much power is required by an external agent to keep the rod moving at the same speed (=12cm.s^(-1)) when K is closed? How much power is required when K is open?