Answer the question regarding earth's magnetism:
The earth's field, it is claimed, roughly approximates the field due to a dipole of magnetic moment `8 xx 10^(22) JT^(-1)` located at its centre. Check the order of magnitude of this number in some way.

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

Answer the question regarding earth's magnetism: A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth's magnetic field.

The earth magnetic field at the equator is approximately 0.4G. Estimate the earth's dipole moment.

A short bar magnet placed with its axis at 30^(@) with a uniform external magnetic field of 0.25T. T experiences a torque of magnitude equal to 4.5 xx 10^(-2)J . What is the magnitude of magntic moment of the magnet?

A magnetic needle has a magnetic moment 5xx 10^(-2) "Am"^(2) . If the moment of inertia of a magnet about an axis passing through the centre and perpendicular to the length of a magnet is 1.0 xx 10^(-7)"kgm"^(2) then calculate the magnitude of the magnetic field which sets the magnet into oscillation at a frequency of 2 Hz.

A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60^@, and one of the fields has a magnitude of 1.2 xx 10^(-2)T. If the dipole coines to stable equilibrium at an angle of 15^@ with this field, what is the magnitude of the other field?

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 ms^(-1) at right angles to the horizontal component of the Earth's magnetic field 0.30 xx10^(-4) Wb " "m^(-2) . (a) What is the instantaneous value of the emf induced in the wire ?