- #1

Lizi

- 4

- 1

**1. The problem statement**

Two charges of 3μC and -2μC are placed 2cm apart. At what point along their connecting line is electric potential zero?

## Homework Equations

Electric potential superposition Φ=Φ1-Φ2 since q2 is negative

Φ=kq/r^2

## The Attempt at a Solution

Let’s say the charges are on the x axis. Their coordinates would be x1 and x1+2

The coordinate of the point we’re looking for is x

so kq1/(x-x1) - kq2/(x-x1-2) = 0

3/(x-x1) = 2/(x-x1-2)

x-x1=6

So the point is 6cm away from q1, but the answer says 0.8cm away from q2 and I don’t get it

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