A long straight current-carrying conductor has current directed from bottom to top when held vertically. What will be the direction of magnetic field lines when observed from below the conductor?
Correct answer: A. Clockwise
- A. Clockwise
- B. Anti-clockwise
- C. Vertically upward
- D. Vertically downward
Explanation
The magnetic field generated by a long straight current-carrying conductor can be determined using the right-hand rule. When the current flows from bottom to top, if you point your right thumb in the direction of the current, your fingers will curl around the wire. When viewed from below, the fingers will curl in a clockwise direction, indicating that the magnetic field lines are oriented clockwise. The other options are incorrect because they do not represent the actual behavior of magnetic field lines around a straight current-carrying wire.
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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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