The magnet can be completely demagnetized by
Breaking the magnet into small pieces
Heating it slightly
Droping it into ice cold water
A reverse field of appropriate strength
Magnetic lines of force due to a bar magnet do not intersect because
Give the location of magnetic :
$(i)$ north pole
$(ii)$ south pole
The magnetic field lines due to a bar magnet are correctly shown in
Earth magnetic field at equator is approximately $0.4\,G$ then earth's dipole moment would be (nearly) (ralius of earth $= 6.4 \times 10^6\,m$ )
Calculate the axial field of a finite solenoid.