About a month ago I asked what could be the part 1 of this question, and here's the part two.(adsbygoogle = window.adsbygoogle || []).push({});

Say you take a thin flexible rod with charge Q, bend it into a semicircle (half circle going from pi/2 to 3pi/2) with radius R.

Find an expression for the electric potential at the center of that semicircle.

I know that this has something to do with finding the electric field at the center point and then taking the negative integral to find electric potential.... but i'm not even sure how to start.

Normally, there would end up being cos/sin getting integrated due to there being a need for components when calculating electric field. However, when going to electric potential, how can the vector values be turned into scalars? Ahhhhhhhhhhh!

Any sort of help, starting help and a shove in the right direction would be awesome.

-twiztidmxcn

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric Potential at center of semi-circular rod

**Physics Forums | Science Articles, Homework Help, Discussion**