Dear student,Magnetic Field - A region around a magnetic material or a moving electric charge within which the force of magnetism acts is known as Magnetic field. Magnetic fields are produced by electric currents. The Standard unit for magnetic field is Tesla.Magnetic flux is defined as the number of magnetic lines of force passing through a surface normally, that is perpendicular to the surface. is common expressed as B.ds = Bdscosθ where B is the magnetic field while ds is the small surface area. Regards