Tipler6 21.P.054. 1) An electron is released from rest in a weak electric field

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Tipler6 21.P.054. 1) An electron is released from rest in a weak electric field given by -2.6 x 10 10 N/C j. After the electfon has vertical distance of 1.8 m , what is its speed? (Do not neglect the gravitational force on the electron mm/s Submit You currently have O submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. Copyright O 2017 Freeman Worth Publishers a division of Macmillan Learning. About | Tech Support | Find Your Local Sales Rep | Terms Of Use | Privacy Policy

Explanation / Answer

Taking -ve j as downward direction
Electrical force on electron in upward direction = e E = 1.6x10-19 * 2.6x10-10 = 4.16x10-29 N  
Gravitational force on electron in down ward direction = mg = 9.1x10-31*9.8 = 8.92x10-30 N

Net force in upward direction = 3.27x10-29 N
Acceleration = net force /m = 35.9 m/sec2
speed after travelling distance s, starting from rest at constant acceleration = ( 2 a s)1/2
=( 2 * 35.9 * 1.8x10-6 )1/2 = 1.1 x10-2 m/s  

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