ch21-p038 - 38. Let F12 denotes the force on q1 exerted by...

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38. Let 12 F G denotes the force on q 1 exerted by q 2 and 12 F be its magnitude. (a) We consider the net force on q 1 . 12 F G points in the + x direction since q 1 is attracted to q 2 . 13 F G and 14 F G both point in the – x direction since q 1 is repelled by q 3 and q 4 . Thus, using d = 0.0200 m, the net force is () ( ) 2 11 21 31 4 2222 00 0 0 2 92 2 1 9 25 2 2 2| | (2) (4) 44 ( 2 ) 4 ( 3 ) 1 8 4 8.99 10 N m C 1.60 10 C 11 3.52 10 N 18 2.00 10 m ee e e e FF F F dd d d πε =−−= = ×⋅ × == × × , or 25 1 ˆ
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