DIRECT new History Bookmarks People Window Help MasteringPhysics: Ch 27 HW https

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DIRECT new History Bookmarks People Window Help MasteringPhysics: Ch 27 HW https session masteringphysics.com/myctitemview?assignmentProblemID 76253725 12: Physics for Science & Engineering II Spring '16. Current and Cument Density at a Junction 4 of 12 and Current Density at a Junction The magnitudes of the cument density and the diameters for wires 1and 2 are given in the table. The current directions are indicated by the arrows r the incion of three wires as shown in (A/mm 18 45 Part A Find the aument Is in wire 3. Express your answer in and current into the junction negative to two significant figures. Call current out of the junction -0.9 A sho you need the answer obtainedin Part subsequently. use the unrounded answer inthis Part B Find the magnitude of the current density Jain wie 3 The dameter of wire 3 is 1.5 mm in amperes View All Assignments

Explanation / Answer

For the part A )

current I3 = - 9.9A

B) current density is J3 = I3/A3 = (9.9)/(pi*(d3/2)^2) = 9.9/(3.142*(1.5*10^-3/2)^2) = 5.6*10^6 A/m^2 = 5.6 A/mm^2

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