Question Detail

An alternating current (AC) continuously changes both its magnitude and direction sinusoidally. According to Ampere's Law and the principles of electromagnetism, a magnetic field is produced by moving charges (current). If the current's magnitude changes, the magnetic field strength will also change. If the current's direction changes, the magnetic field's direction will also change. Therefore, an alternating current flowing through a coil will produce a magnetic field that has both alternating strengths and alternating directions.