2.1.4. Magnetic field of a current-carrying coil
A coil comprises several conductor loops. The overall magnetic field is derived from the magnetic fields of the individual conductors.
A current-carrying coil has both a north and south pole.
(1) Magnetic field of a conductor loop
The magnetic field lines emerge from the north pole and enter the south pole.
If one clamps such a current-carrying coil with one’s right fist so that the bent fingers point in current direction, then the projecting thumb points towards the north pole. (clockhand principle)
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