Given:

Current through the wire, I = 35 A

Distance of point P from the wire, d = 20 cm

Using Biot Savart law we can find magnetic field at a distance d from a current carrying conductor.

It is given by:

…(1)

Where,

B = Magnetic field strength

I = current through the coil

�₀ is the permeability of free space.

�₀ = 4 × π × 10^-7 TmA^-1

d = distance of point P

By plugging the values in the equation (1), we get

⇒

⇒ |B| = 3.5 × 10^-5T

In this case the magnetic field at 20 cm away from a current carrying conductor is found to be 3.5 × 10^-5T.