Unit 9 Test: Electricity and Magnetism

If the strength of the magnetic field at A is 200 units and the strength of the magnetic field at B is 50 units, what is the distance to B?

10 units

A 500-watt vacuum cleaner is plugged into a 120-volt outlet and used for 30 minutes. How much current runs through the vacuum?

4.2 amps

If the strength of the magnetic field at B is 20 units, the strength of the magnetic field at A is _____.

80 units

In which of the following circumstances would a current register on the galvanometer?

A magnet being pushed; a magnet being pulled

Earth's magnetic field is most likely to be overburdened due to _____.

A solar flare

The element in an incandescent light bulb that releases light energy is _____.

A thin tungsten filament

If the Earth's magnetic field is overwhelmed by charged ions, which of the following could happen?

All of the above

The Greeks studied charges using _____.

Amber

Ampere showed that parallel wires carrying current in the same direction would ____ each other.

Attract

A positively charged atom or group of atoms can be called a(n) _____.

Cation

The magnetic fields of Earth and several other planets are produced by _____.

Conductive materials in motion

Which of the following factors influence the electrical resistance of a circuit?

Conductivity, Length, Diameter

The electricity that is delivered to our homes from regional generating stations moves over transmission lines that are _____.

High voltage and low current

Why is current supplied to consumers from generating plants in the form of alternating current?

It is a much more efficient mode of transmitting

In a circuit, a battery is used to _____

Raise the potential of electrons

Charge q is 1 unit of distance away from the source charge S. Charge p is four times further away. The force exerted between S and q is _____ the force exerted between S and p.

Sixteen times

Electrostatic charges are created by _____.

Stripping other electrons from substances

A large electrostatic generator is commonly called a(n) _____.

Van de Graaf Generator

The unit of electric potential or electromotive force is the _____.

Volt

As more resistors are added to a parallel circuit, the current

increases