Polarity of an electromagnet can be changed by ________
A) changing the amount of current flow through the coil of wire
B) changing the frequency of the current flow through a coil of wire
C) changing the direction of current flow through the coil of wire
C
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What will be an ideal response?
In the standard welding symbol, the ____ is added only when needed for the purpose of including a specification process or other reference.
A. header B. arrow C. trailer D. tail
One way that chickens are used in urban gardens is with something called a chicken _____
A) tiller? B) plow? C) tractor? D) mulcher
____ is so named because pieces coated with it bond on contact and need not be clamped under pressure.
a.Yellow glue b.White glue c.Contact cement d.Epoxy