Q9 of 54 Page 277

A magnetic dipole of magnetic moment 0.72 A m2 is placed horizontally with the north pole pointing towards south. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

Given :-



When the magnet is such that the its north pole faces the geographic south of earth, the natural point lies along the axial line of the magnet







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7

A bar magnet has a length of 8 cm. The magnetic field at a point at a distance 3 cm from the centre in the broadside-on position is found to be 4 × 10–6 T. Find the pole strength of the magnet.

 8

A magnetic dipole of magnetic moment 1.44 A m2 is placed horizontally with the north pole pointing towards north. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

 10

A magnetic dipole of magnetic moment 0.72√2 A m2 is placed horizontally with the north pole pointing towards east. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

 11

The magnetic moment of the assumed dipole at the earth’s centre is 8.0 × 1022 Am2. Calculate the magnetic field B at the geomagnetic poles of the earth. Radius of the earth is 6400 km.