An electron (mass =9.11x10^-31 kg, e= -1.602x10^-19 C ) moves from point A to po

Question

An electron (mass =9.11x10^-31 kg, e= -1.602x10^-19 C ) moves from point A to point B under the influence of an external electric field. The potential difference between the two points is 20 kV. Compute the speed of the electron as it reaches point B if it starts from rest . Two point charges Q1 = 11.0 mu C and Q2 = -11.0 mu C are located 4.0 cm apart. Let U = 0 when all of the charges are separated by infinite distances. a) Calculate the Potential Energy if a third chage Q3 = -4.8 mu C is placed at pont C b) With Q3 now positioned Calculate Potential Difference VAB between point A and B

Explanation / Answer

2) work done by electric force = change in K.E.

q (deltaV) = mv^2 /2   - 0

1.602 x 10^-19 x 20 x 10^3   = 9.11 x 10-31 x v^2 /2

v = 8.39 x 10^7 m/s

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