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Of the three basic classifications of magnetic materials,  _______________ materials are either metal or nonmetal materials that cannot be magnetized.

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What type of magnets do not require any power or force to maintain their field?


A) electromagnets
B) permanent magnets
C) temporary magnets
D) domain magnets

E) A) and D)
F) B) and C)

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A basic law of magnetism states that unlike poles _____ and like poles _____.


A) attract; repel
B) repel; attract

C) A) and B)
D) undefined

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The strength of an electromagnet is primarily proportional to its _____.


A) length
B) ampere-turns
C) diameter
D) core resistance

E) None of the above
F) A) and B)

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The north pole of a compass needle points in the direction of the south geographic pole.

A) True
B) False

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