Which of the following best describes the magnetic field lines created by a long, straight, current-carrying wire?
Correct answer: B. Circles centered on the wire
- A. Rays that emerge from the wire
- B. Circles centered on the wire
- C. Lines parallel to the wire
- D. Lines perpendicular to the wire
- E. Noncircular ellipses centered on the wire
Explanation
Whenever we have current flowing through a wire, we have concentric circles of magnetic field lines around the wire making it the central point of origin.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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