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## Homework Statement

A strip of invisible tape 0.13 m long by 0.019 m wide is charged uniformly with a total net charge of 5 nC

(nano = 1 ✕ 10−9)

and is suspended horizontally, so it lies along the

*x*axis, with its center at the origin, as shown in the figure below. Calculate the approximate electric field at location

0, 0.02, 0

m (location

*A*) due to the strip of tape. Do this by dividing the strip into three equal sections, as shown in the figure below, and approximating each section as a point charge. (Assume each point charge is located at the center of the section it approximates. Express your answer in vector form.)

http://prntscr.com/9xvusu picture of the tape.

(a) What is the approximate electric field at

*A*due to piece 1?

## Homework Equations

E = kq/r^2 rhat

## The Attempt at a Solution

I did K * Q which is (9 * 10^9)* ((5/3) * 10 ^ -9)) which comes out to 15. Then I attempted to find r^2, which I believe would be (.02^2 + .13^2) and do 15 / .0173. Then I tried to multiply by the unit vector r <.98837, .15205, 0> to get <856.9697, 131.6415, 0> as my answer. I'm guessing there's some problem with how I'm calculating the r values since when I did part b (b) What is the approximate electric field at

*A*due to piece 2?

it worked, but I was only managing the y component (.02m) since it was right below point A.

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