i finally found the answer at this site http://www.netdenizen.com/emagnet/solenoids/solenoidonaxis.htm
but can u tell me how i can calculate force in the solenoid because i think I've got everything i need(B,m etc.)
Hi!
I need formula for magnetic field of solenoid on axis of solenoid in some distance from center.Also I need something about interaction magnetic field on material point(interaction solenoid on material point).I want to know force that infuence on material point. Thx in advance and sry for my...