2 • Atomic Theory on Charge

Define the SI unit of charge

C

Define Electrostatic Force

The forces of attraction and repulsion between protons and electrons

Differentiate between attraction and repulsion

• Like charges repel

• Unlike charges attract

State the Atomic Theory on Charge

When materials are rubbed together, atoms are rubbed together - negative charge is removed from one material and gained by the other

What happens to a positively charged body according to the atomic theory on charge?

Loses negatives

What happens to a negatively charged body according to the atomic theory on charge?

Gains negatives

What happens to an uncharged body according to the atomic theory on charge?

Has equal amounts of negative and positive charge

Demonstrate Forces Between Electric Charges • Repulsion • 1

• Rub 2 polythene rods with a wool cloth

• Place one to hang off a retort stand

Demonstrate Forces Between Electric Charges • Repulsion • 2

• Rods repel eachother when near

• Like charges repel

Demonstrate Forces Between Electric Charges • Attraction • 1

• Rub a polythene rod and a perspex rod with a wool cloth

• Place one to hang off a retort stand

Demonstrate Forces Between Electric Charges • Attraction • 2

• Rods attract eachother when near

• Unlike charges attract