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A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is


A) parallel to the field lines.
B) perpendicular to the field lines.
C) none of these

Correct Answer

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Magnetic compasses reportedly were first used for navigation by


A) Aristotle.
B) Australian aborigines.
C) Chinese sailors.
D) none of the above

Correct Answer

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Biomagnetism has been detected in


A) bacteria.
B) pigeons.
C) wasps.
D) humans.
E) all of the above

Correct Answer

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Over geologic history the Earth's magnetic field


A) has been relatively stable.
B) has increased in strength exponentially.
C) has reversed direction many times.
D) is unknown.

Correct Answer

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Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is


A) at or about 50 N.
B) exactly 100 N.
C) need more information

Correct Answer

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