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Question 23 of 36

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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

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