State Biot Savart's law. A current I flows in a conductor placed perpendicular to the plane of paper. Indicate the direction of the magnetic field due to a small element `dvecl` at a point P at a distance `vecr` from the element as shown in figure.

A current 'I' flows in a conductor placed perpendicular to the plane of paper. Indicate the direction of the magnetic field due to a small element d vecl at a point P situated at a distance vecr from the element as shown in the figure HQ 1.

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

The magnetic field dvecB due to a small current element dvecl at a distance vecr and element carrying current i is,

The magnetic field (dB) due to a small element. (dl) at a distance (vecr) and element carrying current I is

figure 4.22 shows two long wires A and B, each carrying a current I, separated by a distance l and oriented in a plane perpendicular to the plane of paper. The directions of currents are shown in figure. Find the magnetic induction at a point P located at a distance l from both wires as shown in figure4.22

Write Biot Savart expression for the magnetic field due to a current element in vector form.

The magnetic field bar(dB) due to a small current element bar(dl) at a distance vec(r) and carrying current 'I' is