Keywords: Prawo przeplywu.svg pl Prawo przepływu prawo Ampera N I H<sub>1</sub> l<sub>1</sub> + H<sub>2</sub> l<sub>2</sub> Drawing of an Wikipedia electromagnet with a closed magnetic circuit showing the quantities needed to calculate the magnetic field using Ampere's Law N is the number of turns of the wire winding I is the current in the winding in amperes l<sub>1</sub> is the length of the flux path or magnetic circuit lying within the magnetic core in meters H<sub>1</sub> is the strength of the magnetizing field in the core in ampere-turns l<sub>2</sub> is the length of the air gap and H<sub>2</sub> is the strength of the magnetizing field in the air gap Ampere's Law is <math>N I H_1 l_1 + H_2 l_2</math> own Zureks 2009 Magnetism diagrams |