- #1

winterwind

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**voltage/charge problem**

## Homework Statement

Imagine a small metal sphere left by some alien civilization is floating in space. A

probe is launched directly at the sphere in order to study it. When the probe is

1000 m from the sphere, it detects a voltage of 110.0 V; and when it’s at 100.0 m

it records 10.0 V. What, if any, is the charge on the sphere?

## Homework Equations

I used V = (kq)/r

## The Attempt at a Solution

Solve for q to get q = V(r/k). Plug in the values for each situation, and get q. The thing is, I get different values of q for each set of values. I must be using the wrong equation...but I can't figure which equation to use that relates charge and volts.

Thanks!

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