Physics Review Question
Unit:
Electric
Year:
1992 Question#:
25
Question:
Two equal charges, A and B, are positioned as shown below.
At which location is the electric field intensity due to these two charges equal to
zero?
(1
) A
(2
) B
(3
) X
(4
) Y
What is this question really asking?
Explanation by: John L
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Answer 1
A
INCORRECT
A is on the edge, strong electric field.
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Answer 2
B
INCORRECT
B is on the edge, feeling strong field intensity.
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Answer 3
X
CORRECT
X is between the two positive charges, feeling a field intensity of zero because the
force from one charge directly counteracts the force from the other charge.
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Answer 4
Y
INCORRECT
Y is on the far outer edge so it feels only a lop-sided charge.
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What's this question really asking?
Where is the force on a test charge zero?
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