Electromagnetic field: WAEC Physics Past Questions and Answers

What the WAEC syllabus covers in Electromagnetic field

Our summary: How moving magnets and currents interact, induction, generators and transformers, and power transmission.

• Concept of electromagnetic field (Identifying the directions of current, magnetic field and force in an electromagnetic field (Fleming's left-hand rule).)
• Electromagnetic induction - Faraday's law, Lenz's law and motor-generator effect (Applications: generator (d.c. and a.c.), induction coil and transformer. The principles underlying the production of direct and alternating currents should be treated. Equation $E = E_0 \sin\omega t$ should be explained.)
• Inductance (Qualitative explanation of self and mutual inductance. The unit of inductance is henry (H). Application in radio, T.V., transformer. (Derivation of formula is not required.))
• Eddy currents (A method of reducing eddy current losses should be treated. Applications in induction furnace, speedometer, etc.)
• Power transmission and distribution (Reduction of power losses in high-tension transmission lines. Household wiring system should be discussed.)

Syllabus content © The West African Examinations Council (WASSCE (harmonised West African syllabus)).