Three equal positive charges are placed on the x-axis, one at the origin, one at x = 2 m, and the third at x = 4 m. Of the following points, which has the greatest magnitude electric field?
a. x = 1 m
b. x = 3 m
c. x = 5 m
d. The electric field has the same magnitude at all three positions.
C
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Fill in the blank(s) with the appropriate word(s).
A 100 N picture hangs from a nail in the wall. The diameter of the nail is 3.00 mm. The shear stress on the nail is
a. 
b. 
c. 
d. 
e. 
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