problem21_69

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

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21.69: a) - - + = - - + = 2 2 2 0 2 0 2 0 ) 1 ( 1 ) 1 ( 1 4 1 ) ( 4 1 ) ( 4 1 a x a x a qQ πε x a qQ πε x a qQ πε F q . 4 4 1 .)) . . 2 1 ( . . . 2 1 ( 4 1 3 0 2 0 2 0 x a πε qQ a x a qQ πε a x a x a qQ πε F q - = - = + - - But this is the equation of a simple harmonic oscillator, so: . 2 1 2 3 2 3 0 3 0 a kqQ a ε qQ π f a ε qQ πf ω = = = = b) If the charge was placed on the
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