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?
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