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problem21_93

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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21.93: a) The y -components of the electric field cancel, and the x -components from both charges, as given in problem 21.87 is: . ˆ ) ( 1 1 2 4 1 ) ( 1 1 2 4 1 2 1 2 2 0 2 1 2 2 0 i F + - - = + - - = a y y a Qq πε a y y a Q πε E x If . 4 1 ˆ )) 2 1 ( 1 ( 2 4 1 , 3 0 2 2 0 y Qqa πε y a ay Qq πε a y - = + - - - i F b) If the point charge is now on the x -axis the two charged parts of the rods provide different forces, though still along the x -axis (see problem 21.86 ). i E F i E F ˆ 1 1 4 1 and ˆ 1 1 4 1 0 0 + - - = = - - = =
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Unformatted text preview: x x a Qq πε q x a x a Qq πε q So, i F F F ˆ 1 2 1 4 1 + +--= + =-+ a x x a x a Qq πε For . ˆ 2 4 1 ˆ . . . 1 2 . . . 1 4 1 , 3 2 2 2 2 i i F x Qqa πε x a x a x a x a ax Qq πε a x = -+-+- + + + ≈...
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