Finding the direction of the magnetic field generated in the coil solenoid
.Obtained from the right hand กำรอ around the coil. According to the four inches of electricity. The direction of magnetic field the thumb, the thumb Pendant To point to the direction of magnetic field 4 fingers to point to the direction of flow of current
.At present, the electromagnet used in different areas, such as applied to control the movement of electrons in a tube of
television. The control function of the relay switch and switch circuit breaker A
.The function of automatic electric bell bell Used in the work of voidance, etc.!
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