A magnetic field is generated by a current-carrying wire. Which one of the following statements concerning this situation is false?
a) The magnitude of this magnetic field decreases with increasing distance away from the wire.
b) A right-hand rule is useful for determining the direction of the magnetic field at a particular location.
c) The magnitude of the magnetic field is directly proportional to the magnitude of the current.
d) The magnetic field is parallel to the direction of the current in the wire.
Answer: d) The magnetic field is parallel to the direction of the current in the wire.
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Fill in the blank(s) with the appropriate word(s).
If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length halved, what will happen to the overall magnification of the microscope?
a. This will result in no change in the magnification. b. The magnification quadruples. c. The magnification doubles. d. The magnification decreases.
An _________in crystallinity in a polymer increases the yield strength.
Fill in the blank(s) with the appropriate word(s).
To see his full height, Blinky Bill who is 1.0 meter tall needs a mirror that is at least
A) 0.33 m tall. B) 0.50 m tall. C) 0.75 m tall. D) 1 m tall. E) depends on distance from the mirror.