Static Electricity

You are walking on a rug and gain a positive charge. When you touch a neutral doorknob

• Protons flow from your hand to the doorknob, and you get a shock

• Electrons flow from your hand to the doorknob, and you get a shock

• Electrons flow from the doorknob to your hand, giving you a shock

• No charges flow but you still get a shock

A stationary negative charge in an electric field experiences an electric force in the direction

shown.

What is the direction of the electric field?

• to the left

• to the right

• down the page

• up the page

Which of the diagrams shows the correct electric field pattern for oppositely charged parallel plates?

• A

• B

• C

• D

An aircraft flying through the air becomes electrically charged.

What causes this to happen?

• radio waves emitted by the aircraft

• friction of the aircraft with the air

• heating of the aircraft surface

• background radiation in the aircraft

A negatively-charged rod is brought close to an isolated T-shaped piece of metal.

Initially, the metal is uncharged.

Which diagram shows the induced charge on the metal?

• A

• B

• C

• D

Two charged conducting spheres are placed close to one another. One sphere is positively charged and the other is negatively charged. Which diagram shows the distribution of charges and the forces acting on the spheres?

• A

• B

• C

• D

Which list contains only electrical insulators?

• glass, plastic, rubber

• glass, plastic, steel

• glass, rubber, steel

• plastic, rubber, steel

What is the definition of an electric field?

• A region in space in which a mass experiences a force due to earth's gravitational pull

• A region in space through which electromagnetic radiation passes

• A region in space in which a compass needle experiences a force

• A region in space in which an electric charge experiences a force

Which of the following statements about an electrical insulator is correct?

a.

b.

c.

d.

• it contains some electrons but more protons

• it contains some protons but more electrons

• it contains electrons but they are not free to move

• it contains no electrons at all

A negatively charged strip is brought near to (but not touching) an uncharged conductor. If the conductor is earthed it

• becomes negatively charged

• becomes negatively charged on one side and positively charged on the other

• is attracted by the strip

• is repelled by the strip