Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Magnetic field around closed path?
Three wires run in parallel, with the two outer wires carrying known currents, on the left 0.75A and on the right -0.55A. The line integral of the magnetic field H around the closed path encircling the wires is zero. What is the magnitude of the current in the middle conductor?
3 Answers
- debydeteLv 79 years agoFavorite Answer
Amphere's law; The line integral of the magnetic field around a closed path is proportional to the "net" current crossing the surface enclosed by the path.
Since your line integral is zero the net current crossing the enclosed area must be zero. So the third current is -.20A.
In this context the negative sign refers to direction. So you have one .75A current going in one direction and two currents ,.55A & .20A going in the opposite direction.
- ?Lv 45 years ago
artwork around a closed course for conservative fields are continuously 0, yet delivered approximately electric powered fields are no extra conservative (this replaced into maxwell's super contribution to his 4 equations). he extra a term to ampere's regulation which accounted for the displacement cutting-edge. at a similar time as that is a static field the closed loop vital E dot dl is generally 0 and then that is generally happening as Kirchhoff's rule.
