list the factor on which the strength of the magnetic field .due to a straight conductor carrying current depend

how should these be changed to decrease magnetic field at a point ??plzz reply as soon as possible

The factors on which the magnetic field produced by a current carrying straight conductor depends are :current and distance from conductor.

It is:

(a) directly proportional to magnitude of current,(Strength of magnetic field increases on increasing current and decreases on decreasing current)

(b) inversely proportional to the distance from conductor.(As the distance increases the strength of magnetic field increases and vice versa)