`AB` and `CD` are long staright conductors, distance `d` apart, carrying a current `I`. The magnetic field on `BC` due to the currents in `AB` and `CD`

AB and CD are long straight conductor, distance d apart, carrying a current l. The magnetic field at the midpoint of BC is

How does magnetic field due to current carrying conductor vary?

The figure shows the cross-section of a long cylindrical conductor of radius a carrying a uniformly distributed current i. The magnetic field due to current at P is :

The figure shows the cross-section of a long cylindrical conductor of radius a carrying a uniformly distributed current i. The magnetic field due to current at P is :

Illustrate the magnetic field produced due to a straight current carrying conductor.