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Static electricity
3. (a) When a glass rod is rubbed 6. (a) The fundamental law of static
with a piece of cloth, what type electricity governs how charged
of charge does the glass rod objects behave. State this law,
acquire? Considering electron and provide at least one real-
transfer, why does this happen? life example or experimental
(b) Describe what happens when an observation that demonstrates
FOR ONLINE READING ONLY
ebonite (or plastic) rod is rubbed it.
with fur. What charge does the (b) Explain how a balloon rubbed
rod gain, and why? against your hair can be attracted
(c) What happens when a charged to small pieces of paper.
electroscope is touched with a 7. (a) Draw a well-labelled sketch of
finger? What is the name of this a gold-leaf electroscope.
process, and how does it work? (b) How is the electroscope used
4. Identify those which could become for testing the types of charges?
negatively charged for each of the 8. If a metal rod is given a negative
following pairs of materials being charge and brought near another
rubbed together. neutral metal rod,
(a) Glass and silk (a) Will there be an electric force
(b) Fur and glass between them?
(c) Comb and hair (b) If there is a force, will it be
(d) Fur and hard rubber attractive or repulsive? Why?
5. Complete the table by working out (c) What could happen if the first
the overall charge on each object. rod were given a positive charge
Show your calculations. State instead of a negative one?
whether the object is positively 9. Two rubber balloons are rubbed with
charged, negatively charged or hair; will the electric force between
neutral and why. one of the balloons and the hair
be attractive or repulsive? Or, will
Object Overall Why is it the electric force between the two
charge positive, balloons be attractive or repulsive?
negative or Explain.
neutral? 10. State what happens in the following
conditions:
(a) An ebonite rod is rubbed with
fur.
(b) A negatively charged
electroscope’s cap is touched
by a neutral glass rod.
(c) A proof plane is inserted in a
hollow sphere and tested for
charge.
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Physics Form 2 Final.indd 37 25/10/2025 10:25
