Magnetic field inside a toroidal solenoid is

The magnetic field inside the toroidal solenoid is independent of the radius of the toroid. The magnetic field in the open space inside (point P) and exterior to the toroid (point Q) is zero. According to Ampere’s law, if the net current is zero, the magnetic field must be zero. Therefore, for locations outside the solenoid’s radius, the magnetic field is zero.

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