State two methods to demagnetize a bar magnet

What is a Bar Magnet?

Answer the following questions: State two methods of concentration of ores in which the heavy particles of ores can be separated from the light gangue particles by the gravitational method .

Answer the following questions: Explain with the help of a diagram how the intersity and direction of the magnetic field of a bar magnet can be determined.

Two lines of force due to a bar magnet

Draw neat labelled diagrams to show magnetic field due to a bar magnet . At an Equitorial point

Draw neat labelled diagrams to show magnetic field due to a bar magnet . At an arial point

Draw the magnetic force lines of bar magnet?

The ratio of magnetic fields due to a bar magnet at the two axial points P_(1) and P_(2) which are separated from each other by 10 cm is 25 :2 . Point P_(1) is situated at 10 cm from the centre of the magnet. Magnetic length of the bar magnet is (Points P_(1) and P_(2) are on the same side of magnet and distance of P_(2) from the centre is greater than distance of P_(1) from the centre of magnet)