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SAT Subject Test
Which of the following is true of the magnetic field produced by a current in a long, straight wire?
Select an Answer
The field is uniform.
Correct Answer:
No
The field increases in strength as the distance from the wire increases.
Correct Answer:
No
The field lines are directed parallel to the wire, but opposite to the direction of the current.
Correct Answer:
No
The field lines are directed radially outward from the wire.
Correct Answer:
No
The field lines form circles about the wire.
Correct Answer:
Yes
View Correct Answer
The correct answer is that the field lines form circles around the wire. This is a fundamental characteristic of magnetic fields produced by currents.
Question Difficulty:
medium