Two stationary positive point charges, charge 1 of magnitude 3.15 nC and charge 2 of magnitude 1.65 nC , are separated by a distance of 31.0 cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. Part A What is the speed vfinal of the electron when it is 10.0 cm from charge 1? Express your answer in meters per second.

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Question 15
Two stationary positive point charges, charge 1 of
magnitude 3.15 nC and charge 2 of magnitude 1.65 nC
, are separated by a distance of 31.0 cm . An electron is
released from rest at the point midway between the two
charges, and it moves along the line connecting the two
charges.
Part A
What is the speed vfinal of the electron when it is 10.0 cm from charge 1?
Express your answer in meters per second.
• View Available Hint(s)
ΑΣφ
Vfinal
m/s
Submit
Transcribed Image Text:Question 15 Two stationary positive point charges, charge 1 of magnitude 3.15 nC and charge 2 of magnitude 1.65 nC , are separated by a distance of 31.0 cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. Part A What is the speed vfinal of the electron when it is 10.0 cm from charge 1? Express your answer in meters per second. • View Available Hint(s) ΑΣφ Vfinal m/s Submit
Expert Solution
Step 2

The change in potential energy is supplied to an electron.

PE=Q1e4πε0r1+eQ24πε0r2-Q1e4πε0r'1+eQ24πε0r'2KE=12meve2

The distances are

r1=r2=ri=d2=31 cm2ri=15.5 cmrf,1=r'1=10 cmrf,2=r'2=21 cm

 

 

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