NS 101 Chapter 6

Electrostatic charge results from

• transfer or redistribution of electrons.

• gain or loss of protons.

• separation of charge from electrons and protons.

• failure to keep the object clean of dust.

In which type of circuit would you expect the same voltage with an increased current as more and more resistances are added to the circuit?

• series circuit

• parallel circuit

• open circuit

• none of the above

In which type of circuit would you expect a reduction of the available voltage as more and more resistances are added to the circuit?

• series circuit

• parallel circuit

• open circuit

• none of the above

A parallel circuit has

• wires that are lined up side by side.

• the same current flowing through one resistance after another.

• separate pathways for the current to flow through.

• none of the above

A transformer

• changes the voltage of a direct current.

• changes the power of a direct current

• changes the voltage of an alternating current.

• changes the amperage of an alternating current

An electromagnet uses

• a magnetic field to produce an electric current.

• an electric current to produce a magnetic field.

• a magnetic current to produce an electric field.

• an electric field to produce a magnetic current.

The current in the secondary coil of a transformer is produced by a

• varying magnetic field.

• varying electric field.

• constant magnetic field.

• constant electric field.

Electromagnetic induction takes place because

• an electric current is measured by the rate of movement of charges.

• the potential is determined by how much work is done.

• electrons have their own magnetic field, which interacts with an externally applied magnetic field.

• copper wire is magnetic, which induces magnetism.

Earth’s magnetic field is believed to originate

• by a separation of north and south monopoles due to currents within Earth.

• with electric currents that are somehow generated in Earth’s core.

• from a giant iron and cobalt bar magnet inside Earth.

• from processes that are not understood.

A piece of iron can be magnetized or unmagnetized. This is explained by the idea that

• electrons in iron atoms are spinning and have magnetic fields around them.

• atoms of iron are grouped into tiny magnetic domains that may orient themselves in a particular direction or in a random direction.

• unmagnetized iron atoms can be magnetized by an external magnetic field.

• the north and south poles of iron can be segregated by the application of an external magnetic field.