208Test4_solutions

# 208Test4_solutions - K Problem 1(7 pts A circuit hangs in...

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K Problem 1 (7 pts) A circuit hangs in the x-y plane. Some coils (not shown in the diagram) make a sizeable magnetic field in the shaded region (of length a and width b) and the wire experiences a force in the +z direction (see axes convention on page 3). ft! (a: 3pts) What is the direction of the magnetic field made by the coils? Circle your choice: +x -x r+y j -y -\-z -z (b: 4pts) If the magnitude of the conventional current in the circuit is / and the magnitude of the mag netic field in the shaded region is B, what is the magnitude of the force on this wire? Circle your choice. (A) 1LB (B) I(2L+2k)B (C)I(2a+2b)B }IaB labB Problem 2 (5 pts) The magnetic field in a region is vertical and was measured to have the values shown on the surface of a cylinder. 10 cm 0.036 T Which of the following are true? Circle nil that, apply. (A) The measurements imply that the cylinder

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Unformatted text preview: (B) The measurements imply that the cylinder contains a current-carrying loop of wire. jCVThe measurements imply that the cylinder contains a bar magnet. measurements are probably incorrect, since we have never yet found a magnetic monopole. )The magnetic flux over the closed cylinder is nonzero, which violates Gauss's Law for magnetism. 1 Problem 3 (9 pts) At a particular instant a proton and an electron arc at the locations shown in the diagram below. The electron is moving with a velocity vE to the right (in the positive x direction), and the proton is moving downward (in the negative y direction) with a velocity vp. On the diagram, draw and label the following vectors: (a: 3pts) Th electric force FE on the electron. (b: 3pts) The magnetic force Fg on the electron. (c: 3pts) The net force Fntl on the electron. Vf x r K v r....
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• Fall '09
• GEORGE
• Magnetism, Magnetic Field

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