Exam 14: Magnetism

When a wire carrying current is placed in an applied magnetic field, a voltage across the wire is created that is proportional to the strength of the magnetic field is

Like magnetic poles attract each other and unlike poles repel.

Every magnet has invisible magnetic field lines that extend outward from the magnetic poles.

Flux density includes total area, whereas flux is for a specified unit area.

Magnetic field lines are affected by air, paper, glass, and wood.

A(n) ______________ needs current from an external source to maintain its magnetic field.

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

What is the device that is basically a switch with contacts that are opened or closed by an electromagnet?

Which of the following is not a nonmagnetic material?

In the cgs system, the gauss is one line per square centimeter.

What magnetic effect is at the heart of such technologies as antilock brake sensors and some keyboards?

Preventing one component from affecting another through their common electric or magnetic field is called

One weber per square meter is called a ______________.

The microweber is smaller than the maxwell unit.

The ability to concentrate magnetic flux is called ______________.

In SI, one weber per square meter is called a tesla.

Every magnet has both a north and a south pole.

The magnet can be considered the generator of an external magnetic field, provided by the two opposite magnetic poles at the ends.

Maxwell proved that electromagnetic phenomena travel in ______________ at the speed of light.

Magnetic field lines never cross each other but instead push apart from each other.