Earth's magnetic field is `5xx10^-5`T. A cable is 10 m above the ground. Calculate the current in the cable, so that it may produce a neutral point with earths' magnetic field on the surface of the earth just below it.

The line joining the points of horizontal component of earth's magnetic field is called

Explain the terms the magnetic field due to earth at a point.

A long straight horizontal cable carries a current of 2.5 A in the direction 10^@ south of west to 10^@ north of east. The magnetic meridian of the place happens to be 10^@ west of the geographic meridian. The earth’s magnetic field at the location is 0.33 G, and the angle of dip is zero. Locate the line of neutral points (ignore the thickness of the cable)? (At neutral points, magnetic field due to a current-carrying cable is equal and opposite to the horizontal component of earth’s magnetic field.)

Calculate the current in a circular coil of radius 5 cm and 100 turns to produce a field of 2 xx 10^-5 T at its centre.

A power line lies along east-west direction and carries a current of 10 ampere. The force per meter due to earth's magnetic field of 10^-4 tesla is

The earth's magnetic field may be considered to be due to a short magnet placed at the centre of the earth and oriented along the magnetic south-north direction. the ratio of the magnitude of the magnetic field on the earth's surface of magnetic equator to that at the magnetic poles

A long vertical wire in which a current is flowing produces a neutral point with the earth's magnetic field at a distance of 5 cm from the wire. If the horizontal component of the earth's magnetic induction is 0.18 gauss, then the current in the wire is

It is found that the neutral points lie along the axis of a magnet placed on a table. What is the orientation of the magnet w.r.t. the earth's magnetic field.