static electricity

Question 1

what is static electricity caused by ? give an example

Answer 1

• two objects rubbing together . this causes electrons to move from one object to another
• e.g. rod has more negative electrons while the cloth has more positive. rod gains electrons

Question 2

negative and negative =
postive and postive =
postive and negative =

Answer 2

• repel
• repel
• attract

Question 3

what happens on a van de graff

Answer 3

• charge builds on dome due to electrons being rubbed off by the belt
• if big enough charge built the voltage becomes high enough to inosise air molecules
• the electron jumps down to earth –> this is an electric current

Question 4

what charge does protons , neutrons and electrons have ?

Answer 4

proton - postive
neutron - neutral
electron (on outside) - negative