Question

Two electrons are fixed 2 cm apart. Another electron is shot from infinity and stops midway between the two. What is its initial speed in (m/s)? Answer:

Answer 1

solution : According to the given data, the following the answer Here, charge on electron ė = 1.6* 1019 C Seperation between the two electron r=2cm re 0.02 m third Let u be the initial velocity at the election Mass of the election m=9.1* 10-31 kg initial kinetic energy Ki=(12) mv Snitial polēnlial energy vi = 0 potential at the mid point = -k(2010) - keel) = -4 kely = - -4(57109 x1620512) 002 = 2880 X10-10 v

Final potential energy of the third election Uf = ev (1.6 ८ 1619) *(-2880x10-10) 4608 * 10-29 TJ - Final kinetic energy Kf O From law of Conservation of energy ki tui z Kftur (12) muVto = 0 +(4608x16529) v2 1011.63 x 102 V = 318. 0613 mis

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