Physics, 02.11.2019 23:31, nicoledambrosia16

(a) consider a flat sheet of metal foil that is infinite in extent. it carries current, with uniform surface current density k = 200a/m i. determine a formula for the magnetic field due to this current at a distance z from the sheet [6] i. imagine that the sheet is cut to a strip m wide and infinitely long, with the current directed perpendicularly to the long axis. now it is rolled into an infinitely long cylinder of circumference 20cm a. calculate the magnetic field amplitude both inside the cylinder, and outside [4] b. derive a formula for the magnetic vector potential at a distance r from the axis of the cylinder c. briefly discuss the relative merits of the approaches using ampere's law, and using the biot-savart law to part a) of this question

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Physics, 02.07.2019 23:20, kayliebush2709

Ampère's law is usually used to find the magnetic field given a current distribution, but it can also be used to find the current given a magnetic field. d the magnetic field shown has a constant magnitude of b, from y 0 to y and is directed out of the page. it has zero magnitude everywhere else. a. where in space is there current? explain. (hint: consider all regions, as well as the boundaries between regions). describe the current distribution. is it a volume current density, a surface current density, or a line current? y=0 y=d where there is non-zero current, describe how you could use ampère's law to find the t density. what ampèrian loop would you choose, and where would you put it? b. where the current density is non-zero, determine its magnitude and direction. express your answer in terms of b, and check your units (volume current density has units of current per area, and surface current density has units of current per length). 2. challenge question (not graded, based on the tutorial supplement in ampère's law). reconsider the square ampèrian loop for the square infinite wire. a. suppose you were given the magnetic field at points a and b. would this be enough information to solve for the current density? explain. uniform current into the page b. suppose you were given the line integral of the magnetic field from point b to point c. would this be enough information to solve for the current density

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Physics, 21.08.2019 03:20, emely1415

Explain the physics for each of the topics on the next page in your own words. in this section, write clear, concise, physical descriptions that guarantee you really understand the important qualitative aspects of electromagnetism. write whatever will you learn the physics as well as possible, but don't write too much more than half a page). you should be able to do this for each topic in a few sentences to a paragraph. don't forget that a picture is worth a thousand words and an equation is worth a thousand pictures this section is probably unlike any physics exam that you have taken. if you have questions, ask me. about the quantitative section the calculations in this section are probably like every physics exam that you have taken. you can do the visualization using the available applets. if you have questions, ask me. about the semi-quantitative section this section is halfway between the qualitative and quantitative sections. use more words, more equations, and more figures than you used in the qualitative section. if you have questions, ask me. semi-quantitative section the magnetic field and the magnetic vector potential: (1) inside and outside of an infinitely long current carrying wire with uniform current density [2] inside and outside of an infinitely long current carrying wire with non-uniform current density j() (3) outside an infinite current carrying sheet with uniform current density [4] inside and outside of an infinite current carrying slab# with non-uniform current density j(z) [5] inside and outside a linear solenoid [6] inside and outside a toroidal solenoid (7) at the center of, on the axis of, and off the axis of a current loop this wire has a circular cross section # the slab has infinite extent along x and y and finite thickness along z optionalextra credit: [8] inside and outside of an infinitely long current carrying square-cross-section wire with uniform current density

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