Two stationary positive point charges, charge 1 of magnitude3.35 nC and charge 2

Question

Two stationary positive point charges, charge 1 of magnitude3.35 nC and charge 2 of magnitude 1.75 nC, are separatedby a distance of 39.0 cm. An electron is released from rest atthe point midway between the two charges, and it moves along theline connecting the two charges. 1.)   What is thespeed (v-final) of the electron when it is 10.0 cm fromcharge 1? Two stationary positive point charges, charge 1 of magnitude3.35 nC and charge 2 of magnitude 1.75 nC, are separatedby a distance of 39.0 cm. An electron is released from rest atthe point midway between the two charges, and it moves along theline connecting the two charges. 1.)   What is thespeed (v-final) of the electron when it is 10.0 cm fromcharge 1? 1.)   What is thespeed (v-final) of the electron when it is 10.0 cm fromcharge 1?

Explanation / Answer

q1 = 3.35 nC, q2 = 1.75 nC, r =39.0 cm, d = 10.0 cm, q = -1.6*10-19 C, m =9.1*10-31 kg, find v initial energy = kq*[q1/(r/2) + q2/(r/2)] =2kq(q1 + q2)/r = -3.7662*10-17J final energy = mv2/2 + kq*[q1/d +q2/(r - d)] = mv2/2 - 5.693*10-17J -3.7662*10-17 = mv2/2 -5.693*10-17 v = 6.51*106 m/s

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