Draw the magnetic field lines for a bar magnet.

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.

Define magnetic field.

The frequency of oscillation of the magnet in an oscillation magnetometer in the earth's magnetic field is 40 oscillations per minute. A short bar magnet is placed to the north of the magnetometer, at a separation of 20cm from the oscillating magnet, with its north pole pointing towards north (figure). The frequency of oscillation is found to increase to 60 oscillations per minute. Calculate the magnetic moment of this short bar magnet. Horizonatl component of the earth's magnetic field is 24 muT .

A magnetic field is produced by

What is Magnetic field ?

To measure the magnetic moment of a bar magnet, one may use

A paramagnetic material is placed in a magnetic field. Consider the following statements : (A) If the magnetic field is increased, the magnetization is increased. (B) If the temperature is increased, the increased the magnetization is increased.

Show that the magnetic field at a point due to a magnetic dipole is perpendicular to the magnetic axis if the line joining the point with the centre of the dipole makes an angle of tan^(-1) (sqrt(2)) with the magnetic axis.

Find (a) the magnetization I , (b) the magnetic intensity H and © the magnetic field B at the centre of a bar magnet having pole strength 3.6 A m, magnetic length 12cm and cross-sectional are 0.90 cm^2 .