In Equation (???)d¯H is the incremental static H field, I is current, dℓ is the vector of the length of a filament of current I, ˆaR is the uni...In Equation (???)d¯H is the incremental static H field, I is current, dℓ is the vector of the length of a filament of current I, ˆaR is the unit vector in the direction from the current filament to the magnetic field, and R is the distance between the filament and the magnetic field.