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gadzuxs
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Homework Statement
A charge q=3.87*(10 to the 9th) Coloumbs is placed at the origin and a second charge equal to -2q is placed on the x-axis at the location x=1.5m. (a) Find the electric potential midway between the two charges. (b) THe electric potential vanishes at some point between the two charges. Find the value of x at this point.
Homework Equations
U=(kq0q)/r
U=(kq)/r
U= U1 + U2
The Attempt at a Solution
(a)
U=(8.99*(10 to the 9th)(3.87*10to the -9th)(-1.9*10to the -9th))/.75
+
U=(9*(10 to the 9th)(-7.74*10to the -9th)(-1.9*10to the -9th))/.75
=
8.2*10to the 10th??
(b)
0=((8.99*10to the 9th)(?))/r