Question

Math-physics problem about Gauss' Law

http://assets.openstudy.com/updates/attachments/53052cace4b022471a64b0f4-munkeyman1985-1392848082760-gausslaw.pdf

Please help me with the first question.

Answer 1

E = q_enclosed/(A*ε_0)
or
E = kq/r
(k = 9*10^9)

Answer 2

\[\frac{ 9*10^9(4.8-2)10^{-6} }{ 4\pi0.081^2 }\]

Answer 3

\[\frac{ 9000*2.8 }{ 4\pi0.081^2 }\]

Answer 4

I REALLY want 4.8 and 2 to be squared, somehow.

Answer 5

I think you're right

Answer 6

but maybe not completely?