Unit: magnetism
Year: 1992 Question#: 34
Question: An electron current (e-) moving upward through a staight conductor creates a magnetic feild. Which diagram below correctly represents this magnetic field?
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What is this question really asking?
Explanation by: Danny A
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Answer 1
INCORRECT
They tried to make this look like a magnet with a North and South pole which is not what they are asking in this question. return to top
Answer 2
INCORRECT
This is also incorrect because again they are trying to confuse you with a magnet with a north and south pole. return to top
Answer 3
INCORRECT
This is wrong because when you go to use the first hand rule your fingers wrap around the pole in the opposite direction than the arrows are going. Remember to use your left hand for negative charges moving. return to top
Answer 4
CORRECT
This answer is correct because when you use the first hand rule and you point your thumb in the direction of the current(which is up in this case) and wrap your fingers around the wire, they end up going in the same direction as this answer. return to top
What's this question really asking?
Which diagram shows the correct magnetic field created by electrons moving up? return to top
