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    #1

    Apr 14, 2012, 09:29 AM
    Physics Problem For Electric potential
    Two point charges (+10nC and -10nC) are located 8cm apart. What is the electric potential energy when a point charge of -4.2nC is placed at points a,b, and c in turn?

    Let U=0 when the -4.2nC charge is far away (but the other two are still in place).
    pemula's Avatar
    pemula Posts: 2, Reputation: 1
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    Apr 14, 2012, 10:29 AM
    U=k* [((q1*q3)/r) + ((q3*q2)/r2)] --> = 8.99*10^-9[((-4.2*10^-9 X 10*10^-9)/0.04m) + ((-4.2*10^-9 X -10*10^-9)/0.12m)]

    =-6.29uJ
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