Question

State Biot-Savart law.

A current I flows in a conductor placed perpendicular to the plane of the paper. Indicate the direction of the magnetic field due to a small element d `vecl` at point P situated at distance `vecr` from the element as shown in the figure.

Answer 1

Biot-Savart’s law states that the magnitude of the magnetic field dB is proportional to the current I, the element`|dl|`, and inversely proportional to the square of the distance r.

The direction of magnetic field is along the negative X-direction.