Exam 14: Magnetism

What are the two classes of magnets?

The wire wrapped in a form of a coil that causes the magnetic field to become more concentrated in an electromagnet is referred to as a(n)

The entire group of magnetic field lines, which can be considered flowing outward from the north pole of a magnet, is called magnetic ______________.

The best shield for a component in a steady magnetic field is a

One weber per square meter is called

What device concentrates the magnetic field of the current in a wire and serves as a simple RF choke?

The weber is a larger unit of magnetic flux and equals 1 x 10⁸ lines or maxwells.

______________ field lines are unaffected by nonmagnetic materials such as air, paper, or plastics.

The earth's geographic North Pole has south magnetic polarity and the geographic South Pole has north magnetic polarity.

The electric or magnetic effect of one body on another without any physical contact between them is called ______________.

The tesla is equal to

The SI units are preferred for science and engineering, but the cgs units are still used in many practical applications of magnetism.

What maintains the strength of the permanent magnet as it becomes magnetized by induction to form a closed loop?

The point at which a magnetic material loses its ferromagnetic properties is the

One weber equals

The earth's geographic North Pole has ______________ magnetic polarity.

A ______________ is a switch with contacts that are opened or closed by an electromagnet.

In terms of molecular structure, iron atoms are grouped in microscopically small arrangements called

One maxwell unit equals

What are the base units for permeability?