Question

A spherically symmetric charge distribution produces the electric field E=(5100r^2) N/C , where r is in m. what is the electric field strength at r=21cm?

Answer 1

this is the solution but it doesn't make sense... http://www.cramster.com/solution/solution/1212337

step b should be m^4. in step c, flux should equal Q/epsilon_naught

Answer 2

nevermind about m^4..

Answer 3

6.6123

Answer 4

I can't use the link :/

Answer 5

it's ok, i got it