A spherical conductor of radius 7.00 mm carries a surface charge density of 9.00 μC/mm2. A second hollow, concentric, spherical conductor has an inner radius of 7.09 mm. How much stored energy is there between the spheres?
surface charge density = Q/A
The Attempt at a Solution
I keep getting 2.5o4e^-4 kJ but it isnt one of the answer choices. There is a 250 kJ, but that makes me off by a factor of 1 million...
Here are the answer choices:
A) 16kJ B) 1000kJ C) 6.4kJ D) 250kJ
Thank you very much!