The strength of the magnetic field due to a long straight conductor is:
Correct answer: C. inversely proportional to the square of the distance from the conductor
- A. the same everywhere around the conductor
- B. inversely proportional to the distance from the conductor
- C. inversely proportional to the square of the distance from the conductor
- D. inversely proportional to the cube of the distance from the conductor
Explanation
C is correct.The strength of the magnetic field (B) due to a long straight conductor is inversely proportional to the square of the distance (r) from the conductor, and it follows the relationship B∝1/ r^2 .
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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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