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## Homework Statement

(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in Figure P15.10.

http://www.webassign.net/sf5/p15_10.gif

That hard to read number is 3 cm.

(b) If a charge of -3.50 µC is placed at this point, what are the magnitude and direction of the force on it?

Magnitude

N

## Homework Equations

E = Keq/r^2

## The Attempt at a Solution

I tried using the formula but was incorrect.

E = 8.99e9(1.5e-6)/.003^2

I used 1.5e-6 for q because i thought you need to use the middle charge and i think the r is .003 m since from -2uC to 1.5uC its 2 cm but it say its 1 cm to the left of the middle charge so i thought i add the distance.

For B i am not even sure how to do since i dont even understand how to do part a.