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## Homework Statement

The electric field map is shown below. (Take it to be a self-consistent scale drawing at a particular moment in time.)

where [itex]\mathrm{q}_4 = +10 C, \mathrm{q}_6 = +10 C [/itex]

What is the charge of [itex]\mathrm{q}_5[/itex] ?

## Homework Equations

## The Attempt at a Solution

I've tried the following values for [itex]\mathrm{q}_5[/itex]:

$$-5,-10,-15,-20$$

and none of them are correct according to the online homework software. How would I find the charge of [itex]\mathrm{q}_5[/itex]?

Thank you,