Electromagnetic Induction - Jamb Physics Past Questions and Answers

Question 11:

• 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 12:

• 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 13:

• 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 14:

• JAMB 1999

The core of an efficient transformer should consist of laminated pieces of metal in order to

A. Increase the heat produced by increasing the eddy current
B. Increase the heat produced by reducing the eddy current
C. Reduce the heat produced by increasing the eddy current
D. Reduce the heat produced by reducing the eddy current

Question 15:

• JAMB 2000

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

A. E/B
B. EB
C. B/E
D. E - B