Solution to practice test problem 912wavelength of am

• Test Prep
• ShivaniK0
• 12
• 100% (1) 1 out of 1 people found this document helpful

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 7 - 10 out of 12 pages.

Solution to Practice Test Problem 9.12(Wavelength of AM Radio)Problem:You wish to build a very long wavelength radio transmitter. If the target wavelength is1000m, atwhat frequency should your transmitter operate?(a)3.3×10-6Hz(b)4.8×104Hz(c-Answer)3.0×105Hz
7
(d)1.9×106Hz(e) Toby.SolutionThe wavelength is related to the frequency byc=λf, thereforef=cλ=3×108ms1000m= 3.0×105HzTotal Points for Problem: 3 PointsSolution to Practice Test Problem 9.13(Energy Stored in LHC)Problem:The ATLAS detector at the Large Hadron Collider uses a superconducting magnet to bend chargedparticles into circular tracks. At the operating current of21,000Athe magnet stored1.1×109Jof energy. Whatis the inductance of the superconducting solenoid used for the magnet?Select One of the Following:
Total Points for Problem: 3 PointsSolution to Practice Test Problem 9.14(Ampere’s Law with Copper Pipe)Problem:A co-axial cable is constructed from two co-axial conductors. The inner conductor is a wire runningdown the axis of the outer conductor. Let the inner conductor carry currentIout of the page and be modeledas infinitely thin. The outer conductor is a cylindrical tube with inner radiusa= 0.20mmand an outer radiusb= 0.25mm. If the tube is long compared to its radius, it can be modeled as an infinite cylindrical conductor.ThecurrentIflows down the tube such that the current is uniformly distributed through the tube. The current in thetube flows into the page. An end view of the system is drawn below.(a)Draw the magnetic field in all regions.(b)Calculate the magnetic field symbolically in all regions.(c)LetI= 0.15A. What is the magnetic field at a pointPat-0.10mmˆxas drawn below? Let the originbe along the center of the wire. Report the field as a vector.8
IIIIIIabPyxwiretubeSolution to Part (a)A total current out of the page is encircled in regions I and IIproducing a counter-clockwise field, by the right-hand rule. Thetotal current encircled in region III is zero, so the field in regionIII is zero.IIIIIIAirAiryxwireGrading Key: Part (a) 3 PointsSolution to Part (b)(a) ComputeBI:In region I, the total current enclosed by a path of radiusrfor0< r < aisIenc=ITherefore, by substituting into the general expression for the magnetic field of a wire, the magnetic field in regionI isvectorBI=μ0I2πrcounter-clockwise9

Course Hero member to access this document

Course Hero member to access this document

End of preview. Want to read all 12 pages?

Course Hero member to access this document

Term
Spring
Professor
chrispurcell
Tags
Magnetic Field, Practice Test Problem