CH19 HW4

# CH19 HW4 - WebAssign Ch19 HW4 S2010(Homework Kiyaniah...

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1. 10/10 points All Submissions Notes Web Assign Ch19 HW4 S2010 (Homework) Kiyaniah Tilghman PY 208, section 003M, Spring 2010 Instructor: Keith Weninger Current Score : 45 / 45 Due : Tuesday, March 2, 2010 12:30 PM EST About this Assignment Extension Requests Question Points 1 2 3 4 10 10 14 11 Total 45/45 (100.0%) Description Applying energy conservation and charge conservation (loop rule and node rule) to more complex circuits Instructions Reading: Sec. 19.9 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Question: MI3 19.P.065 The circuit shown above consists of a single battery, whose emf is 1.3 V, and three wires made of

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the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.3 e-6 m 2 , and is 23 cm long. The thin wire has cross-sectional area 4.9 e-8 m 2 , and is 5.9 cm long. In this metal, the electron mobility is 4 e-4 (m/s)/(V/m), and there are 5e+28 mobile electrons/m 3 . Which of the following statements about the circuit in the steady state are true? The electron current at location D is the same as the electron current at location B . At location B the electric field points toward the top of the page. The magnitude of the electric field at locations D and B is the same. The magnitude of the electric field at locations B and C is the same. The symbol E F represents the magnitude of the electric field at location F , and the symbol E D represents the magnitude of the electric field at location D . Which of the following equations is a correct energy conservation (loop) equation for this circuit, following a path that starts at the positive end of the battery and goes clockwise ? 0 = + 1.3 V - E F * 0.23 m - E D * 0.059 m - E F * 0.23 m 0 = - 1.3 V + E F * 0.23 m + E D * 0.059 m + E F * 0.23 m 0 = - 1.3 V - E F * 0.23 m - E D * 0.059 m - E F * 0.23 m 0 = 1.3 V + E F * 0.23 m + E D * 0.059 m + E F * 0.23 m 1.3 V = E F * 0.23 m 1.3 V = E D * 0.059 m The symbol i F represents the electron current at location F , etc. Which of the following equations is a correct charge conservation (node) equation for this circuit? i F = i D 2* i F = i D i F = 2* i D i F + i D = 0
2. 10/10 points All Submissions Notes Use the appropriate equation(s), plus the equation relating electron current to electric

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