Assuming that the earth's magnetic field is due to large circular loop of current in the interior of the earth, what is the plane of the loop and what is the direction of current around it?

Write expression for the magnetic flux density due to a circular current loop at a point on the axis.

State the Biot-Savart's law for the magnetic field due to a current carrying element. Use this law to obtain a formula for magnetic field at athe centre of circular loop of radius r carrying steady current I . Sketch the magnetic field lines for a current loop clearly indicating the direction of the field.

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

Fig. below shows planer loops of different shapes moving out or into a region of magnetic field, which is directed normal to the plane of the loop and away from the reader. Determine the direction of induced current. in each loop using Lenz's law.

Current loop does not tend to rotate when its plane is bot to the direction of magnetic field. Why?

Using Biot Savart’s law derive an expression for the magnetic field due to a circular current carrying loop at any point on its axis.

Does the torque acting on a loop carrying current in a magnetic field depend upon the shape of the loop.