Question

Ampere rule is used to find the

• A. direction of current
• B. direction of magnetic field
• C. direction of motion of the conductor
• D. magnitude of current

Answer 1

The correct option is B direction of magnetic field

Ampere's law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.

Mathematically ${\mu }_0{I}_{enc}=\int \overrightarrow{B}.d\overrightarrow{l}$

This is used to find the magnetic field due to a current carrying conductor.