21.38 A point charge is placed at Figure E21.38 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 +q +9 of the net electric field at the center of the square due to the four charges, and what is its magnitude in terms of q and a? -9
21.38 A point charge is placed at Figure E21.38 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 +q +9 of the net electric field at the center of the square due to the four charges, and what is its magnitude in terms of q and a? -9
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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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