Electricity and Magnetism Review

In an electromagnet, how can the strength of the magnet be increased?

• use a longer wire

• use a longer nail

• add more coils of wire

• remove the plastic

Which statement is true?

• All magnets have the same shape and size.

• All magnets have a north and south pole.

• All magnets can attract large objects.

• Magnets cannot pull through solids.

The south end of a magnet will repel.

• The copper nail.

• The north end of anoher magnet.

• The south end of another magnet.

• An iron nail.

What is the purpose of the plastic coating usually found on electric wires?

• to strengthen the wires

• to prevent electric shocks

• to make better connections

• to keep the wires from getting hot

Which item would conduct electricity?

• a glass cup

• a chicken feather

• a plastic fork

• a metal fork

In order to turn on the light, a piece of wire needs to be connected from

• A to C

• A to D

• B to C

• C to D

Which of these cause the bits of paper to be attracted to the comb?

• Magnetic forces

• Chemical reactions

• Static electricity

• Heat differences

Which circuit would turn the light bulb on?

• A

• B

• C

• D

When the switch in Fig. 1 is closed, the bulb will light. A plastic ring is inserted in the circuit in Fig. 2. What will happen when the switch is closed in Fig. 2?

• The bulb will light just as it did in Fig. 1

• The bulb will be brighter than it was in Fig, 1

• The bulb will light, but will be less bright than Fig. 1

• The bulb will not light at all.

Which of these is caused by static electricity?

• A magnet attracts a paper clip

• Glue holds two pieces of paper together

• Socks taken from a clothes dryer stick together

• Ice sticks to a car's windshield on a cold winter day