What is Biot Sarvat law explain it???????????????????????????????????????????????????

Dear Kumar A cyclotron accelerates a charged particle beam using a high frequency alternating voltage which is applied between two hollow "D"-shaped sheet metal electrodes called "dees" inside a vacuum chamber.

Biot Sarvat law: Biot Sarvat law gives us the means to calculate the field of an arbitary current distribution. The ontribution dB to the magnetic field Bfrom a length ds of a current I is given by dB=(muenot/4pie)(/rcube)where r is the displacement vector from the current element to the pointp.