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)

current flowing through the conductor

Answer 2

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.