Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
A) relatively small.
B) equally huge.
C) not enough information
Correct Answer:
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Q14: An iron rod becomes magnetic when
A)positive ions
Q15: The source of all magnetism is
A)tiny bits
Q15: The intensity of cosmic rays bombarding the
Q16: Several paper clips dangle from the north
Q17: Refrigerator magnets
A)have short range.
B)are without magnetic poles.
C)both
Q18: Magnetic domains normally occur in
A)iron.
B)copper.
C)silver.
D)all of the
Q20: Magnetism is due to the motion of
Q21: No magnetic force acts on a current
Q23: An electromagnet consists of a
A)bar magnet that
Q24: Superconducting electromagnets
A)exist now.
B)may be possible in the
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