PHYS 142 Lecture Notes - Lecture 22: Curve
29 Apr 2015
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Phys 142: electromagnetism and optics - lecture 22: magnetism part 2. Whenever total current ithrough passes through an area bounded by a closed curve, the line integral of the magnetic field around the curve is given by amp re"s law: A uniform magnetic field can be generated with a solenoid. A solenoid is a helical coil of wire with the same current i passing through each loop in the coil. Solenoids may have hundreds or thousands of coils, often called turns, sometimes wrapped in several layers. The magnetic field is strongest and most uniform inside the solenoid. With many current loops along the same axis, the field in the center is strong and roughly parallel to the axis, whereas the field outside the loops is very close to zero. No real solenoid is ideal, but a very uniform magnetic field can be produced near the center of a tightly wound solenoid whose length is much larger than its diameter.
