Hello everyone i'm stuck on this:(adsbygoogle = window.adsbygoogle || []).push({});

3. [HRW7 30.P.034.] Figure 30-56 shows two circular regions R1 and R2 with radii r1 = 14.0 cm and r2 = 35.0 cm. In R1 there is a uniform magnetic field of magnitude B1 = 50.0 mT into the page and in R2 there is a uniform magnetic field B2 = 75.0 mT out of the page (ignore fringing). Both fields are decreasing at the rate of 8.10 mT/s.

Image:

http://www.webassign.net/hrw/hrw7_30-56.gif

Calculate the integral E.ds for each of the three dashed paths.

(a) path 1 wrong check mark V

(b) path 2 V

(c) path 3 wrong check mark V

I did the following:

Flux b1 = BA = (.05)(PI)(.14) = .02199;

Then i was confused on what I was supppose to do with the given information that the fields are decreasing at a rate of 8.10 mT/s, i saw an example in the book and they divided by that amount so i tried that and got:

2.71495 V which was wrong for path 1. I also tried -2.71495 V which was also wrong. What am i not doing right? Thanks.

**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: Calcuating the integral E.ds for the paths given, what did i do wrong?

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