33_Chapter 15 HomeworkCH15 Electric Forces and Electric Fields

33_Chapter 15 HomeworkCH15 Electric Forces and Electric Fields

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Electric Forces and Electric Fields 33 (b) The magnitude of the retarding force acting on the electron is , and Newton’s second law gives the acceleration as e Fe = E e aF me E m = −= . Thus, the time required to bring the electron to rest is () 0 02 2 ii KE m m KE vv t ae E E == = ( or ) 31 17 8 19 3 2 9.11 10 kg 1.60 10 J 3.37 10 s 33.7 n 1.60 10 C 1.00 10 N C t −− ×× s × = (c) After bringing the electron to rest, the electric force continues to act on it causing the electron to accelerate in the direction opposite to the field at a rate of ( ) ( ) 19 3 14 2 -31 1.60 10 C 1.00 1.76 10 m s 9.11 10 kg eE a m = × × 15.64 (a) The acceleration of the protons is downward (in the direction of the field) and
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This document was uploaded on 10/20/2011.

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