Question

The magnetic field at a point due to a current carrying conductor is directly proportional to:

• A. Resistance of the conductor
• B. Thickness of the conductor
• C. Current flowing through the conductor
• D. Distance from the conductor

Answer 1

Answer: (C), (D)

The correct options are
C Current flowing through the conductor
D Distance from the conductor

The magnetic field at a point P due to a infinite (very long) straight wire carrying a current I is proportional to I, and is inversely proportional to the perpendicular distance R of the point from the wire.