Electricity And Magnetism

Question 1

Name 3 facts about materials

Answer 1

All materials contain positive charges(proton) and negative charges (electron)

An object that has an equal no. of
Electrons and ptotons is neutral (no net charge)

Positively charged objects are electron deficient and negatively charged ones have an excess of electrons

Question 2

How can objects (insulators) be charged

Answer 2

Through contact (or rubbing) - tribo-electric charging

Question 3

What is Tribo-electric charging

Answer 3

A type of contact electrification in which certain materials become electrically charged after they come in contact with different materials and are then separated (such as through rubbing). The polarity and strength of the charges produced differ according to the materials

Question 4

What is the SI Unit for electric charge

Answer 4

The coulomb( C )

Question 5

State the principle of conservation of charge

Answer 5

The net charge of an isolated system remains constant during any physical process such as two charges making contact and then separating

Question 6

What is a condition for Working out the charge of two objects after they touch

Answer 6

The conductors must be the same size

Question 7

State the principle of charge quantisation

Answer 7

All charges in the universe consist of an integer Multiple of the charge of one electron ie 1,6*10^-19

Question 8

What is polarisation

Answer 8

The portion or complete polar separation of positive and negative electric charge in a system