Field patterns

Question 1

Why must a metal must be isolated from the earth to be charged?

Answer 1

electrons transferred between the conductor and the Earth, it is neutralised

Question 2

How is an isolated conductor charged?

Answer 2

by direct contact with any charged object

Question 3

What do electrical conductors contain?

Answer 3

lots of free electrons

Question 4

What is responsible for chariging in most cases?

Answer 4

transfer of electrons

Question 5

What is a gold leafa electroscope?

Answer 5

• used to detect charge
• if charged object in contact with metal cap
  
  • charge is transferred
• the gold leaf and the metal stem which is attached to the cap gain the same type of charge
• leaf rises
  
  • repelled by stem

Question 6

What is the link between electric fields and gravitation and their lines?

Answer 6

• graviational
  
  • due to mass
  • gravitational field line is a line along which a free point mass would move
• electric
  
  • due to charge
  • electric field line is a line along which a free positive charge would move

Question 7

For a charged sphere where is the charge considered to be?

Answer 7

at the centre