Exploring Electricity and Magnetism

Which of the following materials is the best conductor of electricity?

• Rubber

• Copper

• Wood

• Glass

A student connects a battery to a light bulb using wires. Which of the following changes would increase the brightness of the light bulb?

• Using a longer wire

• Using a battery with a higher voltage

• Using a smaller light bulb

• Using a thicker wire

If a magnet is cut in half, what happens to its magnetic poles?

• Each half becomes a magnet with a north and south pole

• One half becomes a north pole and the other a south pole

• The magnet loses its magnetism

• The poles disappear

Which of the following statements best explains why a compass needle points north?

• The needle is attracted to the North Pole

• The needle aligns with Earth's magnetic field

• The needle is repelled by the South Pole

• The needle is made of a special metal

A student wants to build an electromagnet. Which of the following materials should they use to make the core of the electromagnet?

• Plastic

• Iron

• Copper

• Aluminum

A student observes that a charged balloon sticks to a wall. Which of the following best explains this observation?

• The wall is also charged

• The balloon induces an opposite charge on the wall (+,-)

• The balloon is heavier than the wall

• The wall is made of metal

Which of the following changes would decrease the strength of an electromagnet?

• Increasing the number of loops, coils, or turns

• Decreasing the electric current

• Using a material with good conductivity

• Increasing the electric current

Positive (+) and negative (-) charges will

• attract

• repel

The north pole of one magnet would attract which of the following?

• The north pole of another magnet

• The south pole of another magnet

• either the north pole or the south pole of another magnet.

When making an electromagnet, what kind of energy changes into magnetic energy?

• Electrical

• Chemical

• Radiant

• Potential