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21.38 • A point charge is placed at
each corner of a square with side length
a. All charges have magnitude q. Two of
the charges are positive and two are nega-
tive (Fig. E21.38). What is the direction
Figure E21.38
+q
+9
of the net electric field at the center of the
a
square due to the four charges, and what
is its magnitude in terms of q and a?

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