Question

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

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

Answer 1

The correct option is A Current flowing through the conductor

The magnetic field at a point due to a current carrying conductor is given by Biot- Savart law.
$B=\frac{{\mu }_{0}I}{4\pi }\frac{(dl\times r)}{r^3}$
So the field is directly proportional to the current.