Unit: Electricity
Year: 1991 Question#: 24
Question: In the diagram below, A is a point near a positively charged sphere. Which vector best represents the direction of the electric field at point A?
(1
)  |
(2
)  |
(3
) |
(4
)  |
What is this question really asking?
Explanation by: Derek N
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Answer 1
CORRECT
Because that is the direction of the force that a positive test charge would feel
if placed at point A. You remembered that an electric field is defined in terms
of the force felt on a positive test charge.
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Answer 2
INCORRECT
This is not the direction of a positive test charge at point A.
Remember that an electric field is defined in terms of the force felt on a positive
test charge.
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Answer 3
INCORRECT
This is not the direction of a positive test charge at point A.
Remember that an electric field is defined in terms of the force felt on a positive
test charge.
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Answer 4
INCORRECT
This is not the direction of a positive test charge at point A.
Remember that an electric field is defined in terms of the force felt on a positive
test charge.
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What's this question really asking?
If a positive charge were placed at point A what direction would the electric field
be?
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