April 24, 2015

Homework Help: Physics

Posted by Lucy on Friday, April 17, 2009 at 10:52pm.

The following questions use a central charge of q1=+2x10^-4C

1. What is the field strength at a distance of 5m from the central charge?
I got 7.2x10^4 However, I'm not sure which unit to use... is it joules?

2. What is the force acting on another charge (+5x10^-4C) which is 5m from the central charge?
I'm not sure which formula to use. Would it be Fe=(kq1q2)/r^2 ? It just doesn't seem right; would I need to use vectors to find the direction?

3. What is the electrical potential for the charge in question #2 if it is moved from infinity to a distance 3m from the central angle?
This confuses me because I thought it was 5m from the central charge, or is this different?

4. What is the difference in electrical potential if the charge from question #2 is moved from 10m away from the central charge to 2m away from it?

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