A point charge is placed at each corner of a square with side length a. The charges all have the same magnitude q. Two of the charges are positive and two are neg- ative, as shown in Fig. E21.30. What is the direction of the net electric field at the center of the square due to the four charges, and what is its mag- 21.30 .. Figure E21.30O +q +q a a nitude in terms of q and a? 21 31 Two point charges are sena
A point charge is placed at each corner of a square with side length a. The charges all have the same magnitude q. Two of the charges are positive and two are neg- ative, as shown in Fig. E21.30. What is the direction of the net electric field at the center of the square due to the four charges, and what is its mag- 21.30 .. Figure E21.30O +q +q a a nitude in terms of q and a? 21 31 Two point charges are sena
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A point charge is placed at each corner of a square with side length a. The charges all have the same magnitude q. Two of the charges are positive and two are neg- ative, as shown in Fig. E21.30. What is the direction 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?
Transcribed Image Text:A point charge is placed at
each corner of a square with side
length a. The charges all have the
same magnitude q. Two of the
charges are positive and two are neg-
ative, as shown in Fig. E21.30. What
21.30
Figure E21.30
+q
+q
а
a
is the direction of the net electric
field at the center of the square due to
the four charges, and what is its mag-
nitude in terms of q and a?
21.31
Two noint charges are sena-
-9
b.
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