Three point charges, -6.3 x 10-9 C, -9.4 x 10-9 C, and +7.1 x 10-9 C,...
Three point charges, -6.3 x 10-9 C, -9.4 x 10-9 C, and +7.1 x 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2000 V. What is the radius of the circle?
Homework Answers
Total electrical potential is sum of the
potentials due to each charge at the center of the circle .
V = k { q1/r1 + q2/r2 + q3 /r3}
V = 9e9 {-6.3 -9.4+7.1}*1 e-9/ r
-2000= -77.4/r
R= 0.0387m
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Three point charges, -6.3 x 10-9 C, -9.4 x
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Point charges Q_1 = + 3 10^6 C and Q_2 = -9 10^-6 C are fixed on the x axis at x = -11 m and x = +11 m, respectively. Sketch the electric potential (voltage) on the x axis for this system. (NOT FOR CREDIT -- but essential for the next parts.) Your sketch should show that there is a point on the x axis between the two charges where V=0. Is this point closer to Q_1 or...
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