The magnetic field outside a solenoid is a result of the current flowing through the solenoid’s coils. The field lines form concentric circles around the solenoid, with the field strength decreasing with distance from the solenoid. The direction of the field lines can be determined using the right-hand rule, which states that if you point your right thumb in the direction of the current, your fingers will curl in the direction of the magnetic field lines. The magnetic field outside a solenoid can be used to create various applications, such as electric motors and generators.
