Posted by **Spencer** on Monday, March 24, 2008 at 2:16pm.

using the Amperes Law

The circle on the integral means that B(r) must be integrated

A. over a circle or a sphere.

B. along any closed line that you choose.

C. along the path of a closed physical conductor.

D.over the surface bounded by the current-carrying wire.

Im pretty sure its B but I just wanna be positive thank you.

- physics EM -
**Spencer**, Monday, March 24, 2008 at 2:18pm
oops theres a D too.

D. over the surface bounded by the current-carrying wire.

- physics EM -
**bobpursley**, Monday, March 24, 2008 at 2:33pm
http://en.wikipedia.org/wiki/Amp%C3%A8re%27s_circuital_law

"closed Path" which encloses current. B is the best answer. If you choose a closed path which encloses no current, then B is zero. On answer B, it would have been much better to word it "along any closed **path** that you choose". The word line, technically, cannot form a closed surface, and so the term "closed line"is somewhat without meaning.

- physics EM -
**Spencer**, Monday, March 24, 2008 at 2:50pm
I know its this stupid Mastering Physics site. It can word things that straightforward.

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