(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] Some of my Winter Break physics problems

Hey guys, I'm new to this site, and as the way things are going with my physics class, this won't be my last request for help lol.

Well anyway, our teacher assigned us a few problems to do over break, and since I have a week left I decided to start doing them now..

The first problem looks like this:

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Two point charges q1 = +2.20 nC and q2 = -6.50 nC are 0.100 m apart. Point A is midway between them and point B is 0.080 m from q1 and 0.060 m from q2 (Fig. 23.29). Take the electric potential to be zero at infinity.

(a) Find the potential at point A. **right**

(b) Find the potential at point B. **right**

(c) Find the work done by the electric field on a charge of 2.50 nC that travels from point B to point A.

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I got A and B right, but C I've got no clue how to do.. I was going over my notes and saw some sort of integration stuff, but I can't figure out how to do any of that!

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A total electric charge of 2.10 nC is distributed uniformly over the surface of a metal sphere with a radius of 36.0 cm. If the potential is zero at a point at infinity, find the value of the potential at the following distances from the center of the sphere.

(a) 48.0 cm

(b) 36.0 cm

(c) 12.0 cm

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This one, I've got NO CLUE how to do at all...

I know the basic equations v=U/q but what do you plug in where!?

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I guess I'll just leave it at these two for now until I get these right...

Thanks alot!

Peter

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# Some of my Winter Break physics problems

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