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

Question 26:

• JAMB 2012

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

Question 27:

• JAMB 2012

Energy losses through eddy currents are reduced by using

A. Low resistance wires
B. Insulated soft iron wires
C. Few turns of wires
D. High resistance wires

Question 28:

• JAMB 2012

A capacitor of 20 x 10^-12F and an inductor are joined in series. The value of the inductance that will give the circuit a resonance frequency of 200kHz is

A. I/16 H
B. I/8 H
C. I/64 H
D. I/32 H

Question 29:

• JAMB 2013

Induced emfs are best explained using

A. Ohm's law
B. Faraday's law
C. Colomb's law
D. Lenz's law

Question 30:

• JAMB 2015

What is the inductance (L) of an inductor whose reactance is 1Ω at 50/ π hertz (H)?

A. 100 H
B. 0.01H
C. 10H
D. 1H