In this section, we use the magnetostatic integral form of Ampere’s Circuital Law to determine the magnetic field inside a straight coil in response to a steady (i.e., DC) current. The result has a nu...In this section, we use the magnetostatic integral form of Ampere’s Circuital Law to determine the magnetic field inside a straight coil in response to a steady (i.e., DC) current. The result has a number of applications, including the analysis and design of inductors, solenoids (coils that are used as magnets, typically as part of an actuator), and as a building block and source of insight for more complex problems.
