ch22_23_practice_prob_solutions

ch22_23_practice_prob_solutions - Problem 3 (20 pts) Two...

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Unformatted text preview: Problem 3 (20 pts) Two circular coils of wire are located with their centers on the x axis. Coil 1 is connected to a power supply that is not shown in the diagram, and its axis is aligned with the x axis. Coil 2 is composed of3 turns of wire of radius 5 cm, and has a resistance of 0.079. The axis of coil 2 is tilted 30° with respect to the x axis (the axis of coil 2 is remains in the xy plane). The current in coil 1 runs clockwise as seen from coil 2, and is changing with time, resulting in a magnetic field at the center of coil 2 whose magnitude is given by the to Power expression B = 0.04 + 0.131‘ T. supply ~- (a: 5 pts) At t = 3 seconds, what is the direction of current in coil 2? If you are standing on the +x axis looking toward the origin, (10 you see current in coil 2 going clockwise or counter-clockwise? Explain your reasoning. CooNTfl? CLoC/(k/I56; 5T 00!? can 1 Pom/75 my ~x 0“? —> 3 /A/cr?€n$€5 WITH TIME “0.1.9 IN +K D”? an Cu/zrzmT lu (arc 2 15 ch BY K‘IJ.€‘ (b: 15 pts) At t=3 seconds, what is the magnitude of the current in coil 2? Clearly show all steps in your work. H: 8 0M SURFACE Bouuoe‘o 87’ coz¢ .1 (s Afl‘kox. = N1 {Sig/\{zdfg‘fia/A) % M2 (0,13)(cn30°)[/7r,7)r 3(0.:3)(cn30°)77{0.0$)2 ‘ : 4/2 w 0,07 c. 0.0377A Problem 1 (30 pts) At time t=0, an electron at the origin is accelerated (with an acceleration of 2e18 m/sz) for a very short time in the direction indicated in the diagram. You are at location A given by <0, -9, 0> m. The x axis runs to the right, the y axis runs toward the top of the page, and the z axis runs out of the page, toward you. (a: 4 pts) On the diagram draw an arrow showing the direction of a propagation of the radiation that reaches you. Label the arrow “v”. N (b: 4 pts) On the diagram draw an arrow showing aJ.. Label it aJ. 125" Cu. (c: 4 pts) On the diagram draw an arrow showing the direction of the electric field in the radiation reaching you. Label the arrow “E”. (d: 4 pts) On the diagram draw an arrow showing the direction of the magnetic field in the radiation reaching you. Label the arrow “B”. (e: 4 pts) At what time do you first detect electromagnetic radiation? Show your work. Ar =6. At At: 5:: 7'" : 3e—8gse‘c C 3e, ‘6 “4/6 (f: 6pts) What is the magnitude of the radiative electric field that you observe? Show your work. ) .2 _ __L “arty a __ ('/.ée‘/‘i)(/.é‘/ezz br‘x - Llnéo 1 /6r44/ _- 2 c; r- (329) ( ‘1) 4" : 61 cos (725.1'700) 1- o — a? 9 l —‘i V =<2elz)c¢n.(3$-) ’ ' 6' 7‘4" =/.G L/g/fiM/S'z (g: 4pts) What is the magnitude of the radiative magnetic field that you detect? Show your work. > 5‘. L Emil: x113: 6.7/54? I C ...
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ch22_23_practice_prob_solutions - Problem 3 (20 pts) Two...

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