Hello, I have some problems with my solenoid calculations. I have spent many hours, on searching for Formulas, and answers, but exact answer I cannot find. I made 2 electromagnets, and then tried with solenoids. Last solenoid was made with 120 m long wire, 0,3 mm, center diameter was 12 mm and 4 cm long. I achieved 0,5 A on 12V. But solenoid pull force was weak. So here is my question: My goal is to make solenoid which can push iron bolt (center) with neodymium magnet with push force similar with when put two permament magnets with same poles. I planned max 1A and 12 V. How can I make solenoid with max force with such parameters, and what kind of wire I need- 0.3, 0.5, 0.6, 0.7, how long, Is it even possible, to gain such solenoid force, with such parameters. Thanks. And here is an image to show my idea.