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Poles of an Electromagnet

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  P-367

2025-12-09

597

When the ends of a solenoid or an electromagnet are tested with a magnetic needle, it is found that the lines of force pass through the core in the direction.…. There- fore, for determining the poles of an electromagnet, the following rule holds: If the coil is grasped in the right hand with the fingers pointing in the direction of the current, then the thumb will point toward the north pole of the magnet.