Physics Review Question
Unit:
Electricity and magnetism
Year:
1996 Question#:
24
Question:
An inflated balloon which has been rubbed against a person's hair is touched to a
neutral wall and remains attracted to it. Which diagram best represents the charge
distribution on the balloon and wall?
What is this question really asking?
Explanation by: Jay D
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Answer 1
INCORRECT
This is incorrect because like charges repel and opposites attract. This particular
diagram has negative against negative.
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Answer 2
INCORRECT
This has like charges against each other meaning they wont attract, hence the balloon
will not stay on the wall.
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Answer 3
CORRECT
This is correct because the balloon is negative and the wall is positive, hence opposites
attract.
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Answer 4
INCORRECT
This has like charges against each other meaning they wont attract, hence the balloon
will not stay on the wall.
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What's this question really asking?
If you were to rub a balloon, touch it to a wall and it remained there, what would
the orientation of the charges look like?
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