Magnetic field: NECO Physics Past Questions and Answers

What the WAEC syllabus covers in Magnetic field

Our summary: Magnets, magnetic fields around magnets and currents, the force on currents and moving charges, and the earth's field.

• 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 (i) a current-carrying conductor placed in a magnetic field; (ii) between two parallel current-carrying conductors (Qualitative treatment only. Applications: electric motor and moving-coil galvanometer.)
• Use of electromagnets (Examples in electric bell, telephone earpiece etc.)
• 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 $F = qvB\sin\theta$.)

Syllabus content © The West African Examinations Council (WASSCE (harmonised West African syllabus)). NECO questions are matched to the WAEC syllabus topic.