Physics – 4.5.3 Magnetic effect of a current | e-Consult

If the current in the solenoid is increased from 2A to 4A, the magnitude of the magnetic field inside the solenoid will increase proportionally. The magnetic field strength is directly proportional to the current. Therefore, doubling the current will double the magnetic field strength. The direction of the magnetic field inside the solenoid will remain the same. The magnetic field lines will still be parallel to the axis of the solenoid, as determined by the right-hand rule (where the thumb points in the direction of the current and the fingers curl in the direction of the magnetic field).