What this topic covers
Properties of magnets and magnetic materials (practical examples such as soft iron, steel and alloys). Magnetization and demagnetization: Temporary and permanent magnets, comparison of iron and steel as magnetic materials. Concept of magnetic field: Magnetic flux and magnetic flux density. Magnetic field around a permanent magnet, a current-carrying conductor and a solenoid. Plotting of line of force to locate neutral points. Units of magnetic flux and magnetic flux density as weber (Wb) and tesla (T) respectively. Magnetic force on: a current-carrying conductor placed in a magnetic field (qualitative treatment, applications: electric motor and moving-coil galvanometer); between two parallel current-carrying conductors (examples in electric bell, telephone earpiece etc.). Use of electromagnets. The earth's magnetic field: Mariner's compass, angles of dip and declination. Magnetic force on a moving charged particle: Solving simple problems involving the motion of a charged particle in a magnetic field, using F=qvB sin θ.
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