Physics Review Question
Unit:
Electricity and Magnetism
Year:
1991 Question#:
59
Question:
If the diameter of a wire were to increase, its electrical resistance would
(1
) decrease
(2
) increase
(3
) remain the same
(4
) type the fourth answer here
What is this question really asking?
Explanation by: Megan C.
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Answer 1
Decrease
CORRECT
If the diameter of the wire decreases, the electrical resistance will decrease because
there is more space for which the electricity can flow. This causes a decrease in
electrical resistance.
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Answer 2
Increase
INCORRECT
If the diameter of the wire increases the electrical resistance will decrease. The
increase in diameter would not cause an increase in electrical resistance.
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Answer 3
Remain the same
INCORRECT
If the electrical resistance remained the same, the diameter of the wire would not
change.
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What's this question really asking?
If you know what an increase or decrease in the diameter of a wire does to it's electrical
resistance.
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