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## Homework Statement

A metal sphere with a diameter of 10 cm has a charge distribution of 1.09085 x 10

^{18}electrons/cm

^{2}on its surface. What is the electric field strength at a distance of 25 cm from the surface of the sphere? (Answer: 5.5 x 10

^{12}N/C)

## Homework Equations

I wasn't given any equations. Only ones I know are

E= F/q= (kqQ/r

^{2})/q

E= k x Q/r

^{2}

## The Attempt at a Solution

E= (k x Q)/r

^{2}= 9.0 x 10

^{9}x Q/ 25 cm

^{2}= ?