Calculating Charge on 10cm Diameter Sphere: 3700V

[FuzzyDunlop]

Homework Statement

the question is A conducting sphere has a diameter of 10 centimeters. If you measure its voltage to be 3700 V, what is the charge in μC you have put on the sphere?

Homework Equations

V=3700, D=0.1 m, V=kq/R

The Attempt at a Solution

3700= (8.987 * 10^9 * q)/.1

q=.041 microcoloumbs.

but it says I am wrong?? am i making a mistake someplace?

 

[LowlyPion]

What's the radius?

 

[FuzzyDunlop]

What's the radius?

oh my god I am stupid. thanks

 

[LowlyPion]

oh my god I am stupid. thanks

Careless ... maybe, but I suspect you will get over that.

Stupid? Not likely. You were smart enough to ask here.