Rad135 Ch4 Electromagnetism- Part 1 Question Preview (ID: 55288)


This Content Covers Chapter 4 (Electromagnetism- Part 1) From The Text To Help You Prepare For The Midterm Exam In Rad135. TEACHERS: click here for quick copy question ID numbers.

Which of the following does NOT apply to the concept of mutual induction?
a) only one coil is present
b) the primary coil is supplied with current
c) current in the secondary coil is induced by the primary coil
d) two coils are placed in proximity and a varying current is supplied

What piece of equipment is supplied with an electrical current to make a mechanical motion?
a) motor
b) soloniod
c) diode
d) electromagnet

What is the SI unit for magnetic flux density?
a) Weber
b) volt
c) Gauss
d) Tesla

A charged particle in motion creates a(n) ____.
a) negative charge
b) positive charge
c) electrostatic field
d) magnetic field

Which of the following is FALSE of auto-transformers?
a) they are considered a variable transformer
b) the primary coils and secondary coils are in series
c) the primary and secondary windings share a common coil
d) they are effective in controlling voltage on the high voltage side of the circuit

Which is NOT true of magnetic dipoles?
a) flow goes from south pole to north pole within the magnet
b) flow goes from north pole to south pole outside the magnet
c) no matter how small, a magnet always has two poles
d) they are also known as magentic diodes

All of the following are magnetic classifications of materials except ______.
a) ferromagnetic
b) aeromagnetic
c) paramagnetic
d) nonmagnetic

In the case of mutual induction there are two coils and ______ .
a) fixed current is supplied to the primary coil
b) varying current is supplied to the primary coil
c) fixed current is supplied to the secondary coil
d) varying current is supplied to the secondary coil

What is the velocity of all electromagnetic radiation, including all x-ray photons?
a) E = mc^2
b) minimum of 55 kV
c) 100 mR/hr at 1 meter
d) 3 x 10^8 m/sec

Varying magnetic field intensity induces a(n) _________.
a) electric current
b) magnetic dipole
c) static discharge
d) insulator

The magnetic intensity of an electromagnet is greatly increased by the addition of a(n) ____ core.
a) wood
b) iron
c) aluminum
d) copper

Resting an ordinary paperclip in a stationary magnetic field results in:
a) magnetic induction
b) nothing
c) current production
d) repulsion because the paperclip is diamagnetic

Which is NOT true regarding the unit of flux density, the Tesla?
a) The earth's magnetic field is about 0.00001 T
b) An MRI magnet can be 3T
c) Tesla fluctuates with temperature
d) 1 Tesla = 10,000 Gauss

A magnetic field is produced by
a) electric charges at rest
b) electric charges in motion
c) permanent magnets only
d) both a and b

What are materials such as gadolinium, platinum and aluminum, with low permeability and weak attraction to magnetic fields called?
a) ferromagnetic
b) paramagnetic
c) diamagnetic
d) nonmagnetic

What type of magnet is man-made using a steel alloy?
a) magnetic induction
b) natural
c) electromagnet
d) artificial

The magnetic flux through a wire loop
a) requires a constant magnetic field.
b) is maximum when the plane of the wire loop is perpendicular to the magnetic field.
c) increases as the magnetic field decreases.
d) decreases as the speed of the wire loop increases

According to Faraday's Law of Electromagnetic Induction, the size of the induced current depends on four factors. Which of the following is NOT one of the four factors?
a) strength of magnetic field
b) weight of the conductor
c) angle of the conductor to the magnetic field
d) number of turns of the conductor

What is the unit for magnetic flux density and commonly associated with MRI scanners?
a) Weber
b) Gauss
c) Tesla
d) Force

What type of temporary magnet is formed by running an electric current around a ferromagnetic core?
a) electromagnet
b) natural
c) artificial
d) permanent

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