- #1
Ron Burgundy
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Homework Statement
A nonconducting sphere has radius R=2.31 cm and uniformly distributed charge q=+3.50 fC. Take the electric potential at the sphere's center to be V0=0. What is V at radial distance r = 1.45cm?
Homework Equations
E= [tex]\frac{kqr}{R^3}[/tex]
[tex]\Delta[/tex]V=-[tex]\int[/tex]E*ds
The Attempt at a Solution
E = [tex]\frac{k(3.5*10-15C)(.0145m)}{(.0231m)^3}[/tex]
E = 3.70*10-2 V/m
[tex]\Delta[/tex]V=-[tex]\int[/tex]3.70*10-2 V/m * ds
[tex]\Delta[/tex]V=-3.70*10-2 V/m * .0145 m
[tex]\Delta[/tex]V = -5.365*10-4
That's not right according to the book. I keep getting double the right answer when I do problems with electric potential and I can't figure out why.