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The field current is used for the excitation of generators.AnswerYou use DC current, because you want the resulting magnetic field to be constant. If you used AC, the resulting magnetic field would vary in both strength and direction.
People's heights vary. Some are short. Some are tall. Most are close to average. Most probably the 28-year-old male will be in the range between 4 feet and 7 feet, but exceptions are possible.
it can vary
If the mother has sole custody of the child, then yes -- the father doesn't need notification. With joint custody, the answer may vary, but in most cases the father must be at least notified. The permission would be from a judge, not the father.
thay are vary tall
There are multitudes of plastics, and they vary widely in their mechanical properties. It is not possible to assign a tensile strength to "plastic" as there are so many.
The strength of a scrap heap magnet vary depending on the strength of the current or number of "turns" in its primary coil. Increasing either or both of these makes the magnet stronger.
Electromagnet
an electromagnet
electromagnet
Alkalis, bases, vary in strength as do acids
No. But the fastest possible speed can vary by Area!
There is no one classification of normal for grip strength. Factors vary depending on size of hand and strength of hand.
It means that there is lots of possible answers.
An Infantry Batallion has a nominal strength of 1224. It can vary however from 300 to 1300
No. Tornadoes vary greatly in strength, size, duration, speed of travel, and appearance.
Yes, it's possible vary by the teenagers parents' height.