an electron with a speed of 2.0 x 10 6 m/s movesinto a uniform electric field of

Question

an electron with a speed of 2.0 x 106 m/s movesinto a uniform electric field of 500 N/C that is parallel to theelectron's motion. How long does it take to bring the electron torest? (me= 9.11 x 10-31 kg, e=1.6x10-19 c) a. 2.3 x 10-8 s b. 3.5 x 10-8 s c. 1.2 x 10-7 s d. 2.3 x 10-6 s e. 1.2 x 10-5 s an electron with a speed of 2.0 x 106 m/s movesinto a uniform electric field of 500 N/C that is parallel to theelectron's motion. How long does it take to bring the electron torest? (me= 9.11 x 10-31 kg, e=1.6x10-19 c) a. 2.3 x 10-8 s b. 3.5 x 10-8 s c. 1.2 x 10-7 s d. 2.3 x 10-6 s e. 1.2 x 10-5 s

Explanation / Answer

We know that               Elecrtic field is     E = F /q                       or               E = (m a) / q                       or               E  =   { m * (v/t) } / q    Time taken to bring theelectron to rest is :                                  t = ( m v ) / E q                                      = ( 9.11 x 10-31 * 2 x 106 ) / ( 1.6 x 10-19 * 500 )                                     = 0.0228 x 10-6 s                                     =   2.28 x 10-8 s                                      = 2.3 x 10-8 s Hope this helps u!

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