Electroscope%20activity

1
Electroscope activity

• Rub plate and pipe together
• Bring pipe near (but dont touch) electroscope
• What happens?
• Bring plate near (but dont touch) electroscope
• What happens?
• Does you observe any difference between plate and
  pipe?

2
Drawing charge

• The plate is now positively () charged
• What is the charge on the pipe ( or -)?
• Draw a plate and a pipe on your paper with the
  appropriate positive and negative charges
• Can you bring both plate and pipe to the
  electroscope so that the tinsel doesnt respond?
• Why do you think it worked?

3
Modeling your electroscope

• Bring the charged plate near your electroscope
• Model what you see with your paper model
• What kind of charge is causing the tinsel to
  repel?
• Draw your model

4
Charge by Induction 1

• With the plate near the electroscope, touch the
  can with your finger.
• What happens to the tinsel?
• What does this tell you about the charge on the
  tinsel?
• Model what you see
• Draw your model

5
Charge by Induction 2

• Take your finger off the can and then remove the
  plate.
• What do you observe?
• Model what you see.
• Draw the model
• You now have a charged electroscope. What is the
  charge ( or -) on it?

6
Testing a negatively charged object with a
negatively charged electroscope

• Predict what would happen if you slowly brought a
  negatively charged object near your negatively
  charged electroscope
• Model it
• Draw it
• Try it

7
Testing a positively charged object with a
negatively charged electroscope

• Predict what would happen if you slowly brought a
  positively charged object near your negatively
  charged electroscope
• Model it
• Draw it
• Try it

8
Can a neutral electroscope be use to determine
the sign ( or - ) on a charged object?
9
Can you charge your electroscope positively?

• Draw each step in the process

Determine the charge on a vinyl record rubbed
with fur
10
Determine the charge on a vinyl record rubbed
with fur