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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