T2 static electricity

Question 1

what can happen when insulting materials are rubbed together

Answer 1

can become (statically) electrically charged

Question 2

why can insulators become electrically charged when rubbed together

Answer 2

• electrons are rubbed from one material onto the other
• the material gaining electrons becomes negatively charged
• material losing electrons becomes equally positively charged

Question 3

what happens when 2 electrically charged objects are brought close together

Answer 3

exert a force on each other

Question 4

what happens when 2 identically charged objects are brought close together

Answer 4

exert a repulsive force on each other and repel

Question 5

what happens when 2 oppositely charged objects are brought close together

Answer 5

exert an attractive force on each other and attract

Question 6

give an example of a non-contact force

Answer 6

repulsive or attractive force acting between 2 electrically charged objects

Question 7

what is an electric field

Answer 7

region in which a charged object will experience a non-contact electrical force

Question 8

where can electric fields be found

Answer 8

surrounding any charged object

Question 9

describe the electric field around a charged object

Answer 9

• strongest closest to the object

- decreases in strength as you move away from the object

Question 10

what happens to the force between 2 charged objects when they are moved closer together

Answer 10

force between them becomes stronger as the separation reduces

Question 11

in situations where sparks are unwanted, what precaution must be taken to prevent the build up of static charge

Answer 11

any surfaces that are rubbing against each other should be earthed to allow the charge to flow off the materials