(a) Electromagnetic Induction - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1988

The principle of operation of an induction coil is based on

A. Ohm's law
B. Amphere's law
C. Faraday's law
D. Columbs law

Question 12:

• JAMB 1991

If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes

A. Inductance
B. Eddy currents
C. Elecro-magnetism
D. Dipole moment

Question 13:

• JAMB 1992

One of the most important applications of bi-metallic strip is found in the construction of

A. A thermostat
B. An altimeter
C. A thermocouple
D. A hydrometer

Question 14:

• JAMB 1993

Which of the following devices may be used to step up the voltage in a d.c. circuit?

A. A step-up transformer
B. A d.c. generator
C. A wattmeter
D. An induction coil

Question 15:

• JAMB 1993

Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 10³Hz oscillator.

A. 39.0\(\Omega\)
B. 122.5\(\Omega\)
C. 245.0\(\Omega\)
D. 39000.0\(\Omega\)