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The time taken by an electron placed in an electric field 1.2x10^-5 V/m to travel 20mm from rest is?
Asked by varakalasuchi3 | 16 May, 2019, 19:23: PM
answered-by-expert Expert Answer
Let e is charge on electron, E is electric field and m is mass of electron.
 
acceleration = Force /mass = eE/m = (e/m)×E = 1.758×1011 ×1.2×10-5  m/s2
 
if electron is accelerated from rest, then time taken t to travel a dsitance S is given by, 
 
t = begin mathsize 12px style square root of fraction numerator 2 S over denominator a end fraction space end root space equals space square root of fraction numerator 2 cross times 20 cross times 10 to the power of negative 3 end exponent over denominator 1.758 cross times 1.2 cross times 10 to the power of 6 end fraction end root space space almost equal to space 1.38 cross times 10 to the power of negative 4 end exponent space s end style
Answered by Thiyagarajan K | 16 May, 2019, 19:50: PM

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