problem21_88

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

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21.88: a) i E ˆ 4 1 ), 9 . 22 ( . From 2 2 0 a x x Q πε Eq + = . ˆ ) C N 10 29 . 1 ( ˆ ) m 025 . 0 ( ) m 10 5 . 2 ( ) m 10 5 . 2 ( ) 10 00 . 9 ( 4 1 6 2 2 3 3 9 0 i i E × - = + × × × - = - - - C πε (b) The electric field is less than that at the same distance from an infinite line of charge ). C N 10 30 . 1 2 2 4 1 λ 2 4 1 ( 6 0 0 × - = - = = a x Q πε x πε E a This is because in the approximation, the terms left off were negative. ( 29 = + - + 2 2 0 2 1 0 2 1 2 λ 1 λ 2 1 2 2 a x x πε
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