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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 of the net electric field at the center of the Figure E21.38 +4 +9 a. a square due to the four charges, and what is its magnitude in terms of q and a?

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 of the net electric field at the center of the Figure E21.38 +4 +9 a. a square due to the four charges, and what is its magnitude in terms of q and a?

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21.38 A point charge is placed at each corner of a square with side length Figure E21.38 +4 +9 a a. All charges have magnitude q. Two of the charges are positive and two are nega- tive (Fig. E21.38). What is the direction 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? -9
Transcribed Image Text:21.38 A point charge is placed at each corner of a square with side length Figure E21.38 +4 +9 a a. All charges have magnitude q. Two of the charges are positive and two are nega- tive (Fig. E21.38). What is the direction 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? -9
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