Electrostatics

Question 1

How do you charge by friction

Answer 1

When 2 materials are rubbed together electrons are transferred from one materials to another . One will have a negative charge and one will have a positive charge

Question 2

How do you show that there are two types of charge

Answer 2

• Take 2 rods of different materials
• Charge up one by rubbing with a duster
• Suspend it in a stirrup
• Charge the second rod
• Hold it near the suspended one to see the force between the two rods
• Repeat using two similar rods
  Like forces repel
  Different forces attract

Question 3

How do you charge by induction

Answer 3

• Charge a balloon by friction
• As ballon is brought towards the wall electrons in the wall are repelled
• The surface of the wall is left with an overall positive charge
• The balloon is now attracted to the wall

Question 4

How is a comb attracted to dust particles

Answer 4

• Comb when brushed through hair becomes charged
• Electrons move to the top of the particles as they are attracted
• The bottom of the particle is left positively charged
• The top iscloser to the comb so the dust is attracted to the comb

Question 5

Describe a possible danger of fuelling an electrically charged aircraft

Answer 5

A charge building up and when a earthed a spark could occur which could lead to an explosion

Question 6

Explain the uses of a safety wire

Answer 6

Charges can flow through the wire which discharges any build up of charge

Question 7

The droplets of paint are all negatively charged, and explain why this is an advantage

Answer 7

• The paint droplets regeln
• The paint will spread out
• Attracted to object
• Paint reaches back of object

Question 8

How could you show that the plastic rod gain charge

Answer 8

See if rod is attracted to paper pieces and lift them up