The field just outside a metal ball

[Hooke's Law]

Homework Statement

The field just outside a 3.22 cm radius metal ball is 2.72×10^2N/C and points toward the ball. What charge resides on the ball?

Homework Equations

E = k*q/r^2

The Attempt at a Solution

q = E*r^2/k

q = ( 2.72*10^2 N/C )* (0.0322 m^2) / 8.99*10^9

= 3.14*10^-11 C


The computer says I'm giving it the wrong answer...is there something wrong with what I did?


Thanks

 

[Abhishekdas]

The magnitude of your answer seems correct...thats what Gauss's law gives ...
but i think the charge is negative because the field is pointing towards the ball...try it...