The magnetic induction at any point due to a long straight wire carrying a current is

The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by

What is the magnetic induction at a distance of 5 cm from a straight wire carrying a current of 5 mA ?

Find the magnetic induction at a distance of 5 cm from a long straight wire carrying a current of 5A

Deduce the relation for the magnetic induction at a point due to an infinitely long straight conductor carrying current.

Write the relation for the magnetic field induction at a point due to a linear conductor carrying current and hence deduce the relation for the magnetic field induction at a point due to a very long linear conductor carrying current.