Magnetism: Magnet and its types, artificial magnet, methods of preparing magnets, molecular theory of magnetism, demagnetization, magnetic keepers, magnetic lines of force and properties, plotting lines of force, terrestrial magnetism, magnetic storm, magnetic meridian, geographical meridian, relation between V, H, I and $\theta$
Previous Year Questions mapped to syllabus unit.
A magnetic field is measured in Tesla (T) as well as in Gauss (G). The relationship between these two units is given by
A magnetic needle is allowed to oscillate in an uniform magnetic field. Its magnetic moment is 6.7 × 10⁻² Am² and moment of inertia is 7.5 × 10⁻⁶ Kg m². It performs 10 complete oscillations in 6.0 sec. The magnitude of magnetic field is