ULT WUR musbe done on the electron to move It to the negative plate if iIt is in
ID: 1866174 • Letter: U
Question
ULT WUR musbe done on the electron to move It to the negative plate if iIt is initialy s Need Help? rt 6.P015.M Two point charges Q1 -+4.60 nc and Q2--140 nC are separated by 45.0 cm. (a) What is the electric potentiat at a point midway between the charges? (b) What is the potential energy of the pair of charges? What is the significance of the algebraic sign of your answer? O Positive work must be done to separate the charges. Negative work must be done to separate the charges. Need Help? Read ItM ster IExplanation / Answer
A.
Electric potential at midway
V= k(q1+q2) /(r/2)
= 9*10^9*(4.6-1.4)*10^-9/(0.45/2)
= 128 V
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B.
Potential energy of system
U = kq1*q2/r
= 9*10^9*(4.6)(-1.4)*10^-18/0.45
= - 1.288*10^-7 J
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C.
Positive work must be done to seperate the charges
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Comment in case any doubt.. Goodluck
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