Hey All, I'm trying to design a solenoid that would generate about minimum 1.6 A of current in order for me to charge up a 1.5 A 1.5 V battery. I already designed one which is about 10CM in lenght and unknown number of turns (as I used a drill to wind the coils around it. so I would guess its about 2-3 thousands turns). I'm getting about 50 V PK-PK AC . However, I was hoping to make my solenoid smaller and more efficient. I did not perform any theoretical calculation on my first trial (mainly experimental) I was hoping if someone could guide me in the right direction on how I could be able to achieve this much of current. Is there a way to know how many turns/lengths I need based on only the current that I would like to have? B=Mni/l If so, then how would I be able to guess the magnetic flux in the above equation? Thank you all for taking the time reading my post. Looking forward to your suggestions. Cheers.