<P> where k is the demagnetization factor of the core . </P> <P> A finite solenoid is a solenoid with finite length . Continuous means that the solenoid is not formed by discrete coils but by a sheet of conductive material . We assume the current is uniformly distributed on the surface of the solenoid, with a surface current density K; in cylindrical coordinates: </P> <Dl> <Dd> K → = I L φ ^ . (\ displaystyle (\ vec (K)) = (\ frac (I) (L)) (\ hat (\ phi)).) </Dd> </Dl> <Dd> K → = I L φ ^ . (\ displaystyle (\ vec (K)) = (\ frac (I) (L)) (\ hat (\ phi)).) </Dd>

Which factor will not affect the strength of a solenoid