1 - ELECTRICITY & MAGNETISM

It is the magnetic equivalent of Faraday's law of induction.

A. Biot-Savart Law

B. Ampere's Law

C. Lorentz Force Law

D. Coulomb's Law

B

The differential form of Ampere's law is

A. ∇ × H = ρ

B. B = μH

C. ∇ × H = J

D. D = εE

C

The magnetic field of an infinitely long straight wire can be obtained by applying _____.

A. Coulomb's law

B. Ampere's law

C. Maxwell's law

D. Gauss's law

B

ECE Board Exam November 2005

What do you call the non-metallic material that has ferromagnetic properties?

A. diamagnetic

B. silica

C. ferrites

D. carbonites

C

ECE Board Exam November 1996

The current of an electronic circuit is analogous to _____ parameter of a magnetic circuit.

A. mmf

B. flux

C. reluctivity

D. flux density

B

The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?

A. Atomic weight

B. Number of shells

C. Atomic number

D. Valence

D

What is the unit of magnetomotive force, F, in the CGS system?

A. Gauss

B. Gilbert

C. Maxwell

D. Tesla

B
1 A-t = 0.4*pi Gb

Maximum temperature where the ferromagnetic property disappears as a result of thermal agitation.

A. Néel temperature

B. Curie temperature

C. Absolute zero

D. Inferred Absolute zero

B

ECE Board Exam November 2006

1 A/m is equal to how many oersteds?

A. 0.01257

B. 10^8

C. 10^5

D. 0.165

A
1 A-t / m = 4*pi x 10^-3

5 Tesla is equal to how many Gauss?

A. 500 G

B. 5,000 G

C. 50,000 G

D. 500,000 G

C
1 T = 10^4 G

Hydrogen is a _____ element.

A. paramagnetic

B. diamagnetic

C. ferromagnetic

D. antiferromagnetic

B

What is the susceptibility of paramagnetic materials?

A. small and positive

B. small and negative

C. large and positive

D. large and negative

A

Susceptibility - ability to be magnetized when external magnetic field is applied

ECE Board Exam April 1999

Materials that can be easily magnetized in both direction

A. soft magnetic materials

B. high hysteresis magnetic materials

C. hard magnetic material

D. low hysteresis magnetic materials

A

Soft magnetic materials have a low coercivity, meaning they require very little magnetic energy to magnetize or demagnetize.

Coercivity is the magnetic field intensity required to reduce a material's magnetization to zero after it has been magnetized to saturation

The north indicating pole of a compass needle is attracted to which of the following poles of the earth?

A. The magnetic north pole

B. The geographic south pole

C. The magnetic south pole

D. The geographic north pole

C

Volt per meter is equal to

A. ampere per coulomb

B. newton per coulomb

C. coulomb per volt

D. ampere per ohm

B