Abstract
This paper derives the calculating formula of magnetic field of limited solenoid from the Biot-Savart formula. By calculating a real problem, it is proven that the formula is reliable. Magnetic field's computing program is using computer. Lastly, an axis magnetic field and the spatial magnetic field are calculated, and the result is discussed. Also, the calculating formula of magnetic field of square coil is given. And this result can be used in analyzing the magnetic field in electrical engineering
Keywords:Biot-Savart formula Solenoid Magnetic field of square coil