Electrostatic - Theory

Explain how rubbing an acetate rod with a cloth causes the rod and cloth to become charged.

After charging them, the student moves the acetate rod and the cloth closer together. Which statement is correct?

• There is no force between the acetate rod and the cloth

• There is a force of attraction between the acetate rod and the cloth

• There is a force of repulsion between the acetate rod and the cloth

Complete the statement: The amount of charge on the metal dome is increased, which causes the potential difference between the metal dome and the earthed sphere to _______________________

The student tried the experiment using two strips of aluminium. The strips did not move. Complete the sentence:

Materials, such as aluminium, which electricity will pass through easily, are called__________________________

The comb becomes negatively charged because ______________ move from the student’s ________________ to the comb.

• Electrons

• Hand

• Jumper

• Protons

• using a fotocopier

• refueling an aircraft

• a smoke precipitator

• Positively charged objects repel negatively charged object

• Electrical charges move easily through metals

• Static electricity is safe; it never causes any danger

• An electric current is a flow of electrical charge.

Explain the two mechanisms that allow the lightning conductor to properly work

The slide is made from plastic

• The positive and the negative charges in the water are attracted to the rod

• The positive and the negative charges in the water are repelled by the rod

• The negative charge in the water is repelled by the rod and the positive charge is attracted

• The negative charge in the water is attracted by the rod and the positive charge is repelled