The field just outside a 1.70 cm-radius metal ball is 3.75×10^2 N/C and points toward the ball.

Question

What charge resides on the ball?

Express your answer to three significant figures and include the appropriate units.

Answer 1

E = k_eQ/r² (Q will be negative for E field to point towards the ball)

Q = Er²/k_e

sub in and use r= .017 meters