Electric Forces and Electric Fields33(b) The magnitude of the retarding force acting on the electron is , and Newton’s second law gives the acceleration as eFe=EeaFmeEm=−=−. Thus, the time required to bring the electron to rest is ()0022iiKEmm KEvvtaeEE−−===−(or )311781932 9.1110kg1.6010J3.3710s33.7 n1.6010C1.0010 N Ct−−−−××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 ( )( )193142-311.6010C1.001.7610m s9.1110kgeEam−=××15.64(a) The acceleration of the protons is downward (in the direction of the field) and
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