Consider two metal spheres of radii r1 = R and r2 = 2R, both charged to the same potential V0.
a) What is the ratio n1/n2 of their surface charge densities?
n(eta) = charge/area
Er = -dV/dr
The Attempt at a Solution
a) n1/n2 = Q/(4*pi*R2) / Q/(16*pi*R2) = 4
The answer is supposed to be 2, and I don't know what I'm doing wrong.