- #1

abm77

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## Homework Statement

Four charges equal in magnitude of 20.0 microC are placed on the four corners of a square with side length 0.180m. Determine the electric field at the centre of the square.

(-q) ---------- (+q)

l l

l l

l l

(+q)----------(+q)

1 --------------- 2

3-----------------4

Formatting messes up the square but you get the point.

## Homework Equations

**ɛ**= kq / r

**ɛ**= delta V / r

## The Attempt at a Solution

I tried just adding up the combinations of each charge after calculating

**ɛ**= kq / r for each. I didn't feel confident this was the correct way to do it, but no answer or solution was given.

**ɛ1 = k(-0.00002) / 0.180 = -1.00 x 10^6**

= -1.0 x 10^6 + 3(1.0 x 10^6)

= 2.0 x 10^6

**ɛ**2&3&4 = k(0.00002) / 0.180 = 1.00 x 10^6**ɛ**_{total}=**ɛ**1 +**ɛ**2 +**ɛ**3 +**ɛ**4= -1.0 x 10^6 + 3(1.0 x 10^6)

= 2.0 x 10^6

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