Electricity And Magnetism Question Preview (ID: 8187)


Electricity And Magnetism Test For 8th Grade Physical Science. TEACHERS: click here for quick copy question ID numbers.

Jane puts the north pole of a bar magnet near an object on her desk. As the magnet gets closer to the object, the object is repelled and moves away from the magnet. Which of th
a) The object has a north pole but no south pole.
b) The object is a magnet or has been magnetized.
c) The object has randomly-arranged domains.
d) The object is not made of metal.

The wire creates a magnetic field that interacts with the magnetic field of the magnet.
a) The wire creates a magnetic field that interacts with the magnetic field of the magnet.
b) The north pole of the magnet interacts with the south pole of the wire.
c) The battery transfers its magnetic field to the wire.
d) The wire causes the domains of the magnet to rearrange.

Catherine rubs an iron nail in one direction with the south pole of a magnet. Which of the following is true of the magnetized nail?
a) It will only be attracted to the north pole of a bar magnet.
b) It has a strong north pole and a much weaker south pole.
c) Its domains have become rearranged so that they line up in one direction.
d) The bar magnet has caused a random arrangement of the nail’s domains.

An electromagnet used in a junkyard can only pick up cars. How could the electromagnet be improved so that it could lift trucks and other large vehicles?
a) The electric current and the number of coils in the solenoid could be increased.
b) The electric current could be increased and the number of coils in the solenoid could be decrease
c) The electric current and the number of coils in the solenoid could be decreased.
d) The electric current could be decreased and the number of coils in the solenoid could be increase

How can you increase the strength of an electromagnet?
a) increase the number of coils and/or increase the current
b) decrease the number of coils while increasing the current
c) decrease the number of coils and/or decrease the current
d) increase the electric current while decreasing the number of coils

What happens to the magnetic field of an electromagnet if you increase the current in the wire?
a) the magnetic field gets stronger
b) the magnetic field gets weaker
c) the magnetic field is not affected
d) the magnetic field reverses direction

Suki can have all five appliances in her kitchen on at the same time, or she can have each appliance on one at a time. How are the appliances in Suki’s kitchen wired?
a) in a single loop
b) in a direct current circuit
c) in a parallel circuit
d) in a series circuit

Which of the following copper wires will have the least amount of resistance?
a) a short, thin wire
b) a short, thick wire
c) a long, thin wire
d) a long, thick wire

All of the other bulbs would remain lit.
a) Bulb 1 and bulb 2 would go out but bulb 4 will remain lit.
b) Bulb 2 and bulb 4 would go out but bulb 1 will remain lit.
c) All of the other bulbs would go out.
d) All of the other bulbs would remain lit.

As the distance between the objects increases, the size of the electric force decreases.
a) As the distance between the objects increases, the size of the electric force decreases.
b) As the distance between the objects increases, the objects become more positively charged.
c) The size of the electric force is constant.
d) As the size of the objects increases, the size of the electric force between them decreases.

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