Electromagnetic induction: JAMB Physics Past Questions and Answers

What the JAMB syllabus covers in Electromagnetic induction

Our summary: How changing magnetic fields produce voltage, generators and transformers, inductance and eddy currents.

• Electromagnetic induction ((i) Faraday's laws of electromagnetic induction; (ii) Lenz's law as an illustration of the principle of conservation of energy; (iii) factors affecting induced e.m.f.; (iv) a.c. and d.c. generators; (v) transformers; (vi) the induction coil.)
• Inductance ((i) explanation of inductance; (ii) unit of inductance; (iii) energy stored in an inductor: $E = \frac{1}{2}LI^2$; (iv) application/uses of inductors.)
• Eddy current ((i) reduction of eddy current; (ii) applications of eddy current; (iii) effects of eddy current.)

Objectives

• interpret the laws of electromagnetic induction;
• identify factors affecting induced e.m.f.;
• recognize how Lenz's law illustrates the principle of conservation of energy;
• interpret the diagrammatic set up of a.c. generators;
• identify the types of transformer;
• examine principles of operation of transformers;
• assess the functions of an induction coil;
• draw some conclusions from the principles of operation of an induction coil;
• interpret the inductance of an inductor;
• recognize units of inductance;
• calculate the effective total inductance in series and parallel arrangement;
• deduce the expression for the energy stored in an inductor;
• examine the applications of inductors;
• describe the method by which eddy current losses can be reduced;
• determine ways by which eddy currents can be used.

Syllabus content © The Joint Admissions and Matriculation Board (UTME).