S2003-Exam3 - PHYSICS 112 - SPRING 2003 - EXAM 3 SHOW YOUR...

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PHYSICS 112 - SPRING 2003 - EXAM 3 SHOW YOUR WORK! Full credit will be given only if you explain how you arrived at your answer. Either show your work (especially in a calculation) or give a short explanation. Nothing elaborate is required, but the grader must be able to follow your reasoning clearly. 1. A uniform magnetic field of magnitude 0.70 T is in initially perpendicular to the plane of a plane circular circuit loop of radius 0.40 m and resistance 3.0 . H (a) [3] What is the initial magnetic flux through the loop? (b) [6] Over a period of 5.0 seconds the magnetic field is reduced in magnitude to 0.20 T. Determine the average current induced in the loop during this time. (c) [4] Suppose you are looking down on the loop from above it, with the magnetic field pointed towards you. What is the direction of the induced magnetic field of the loop? What is the direction of the current in the loop (clockwise or counterclockwise)? 2. A plane electromagnetic wave of frequency 2.0 10 Hz is traveling in the ‚ C 15 direction in a material with an index of refraction of 1.50 (for this frequency). (a) [4] What is the wavelength of this wave in this material? (b) [3] When the electric field vector of the wave at a certain point in space is pointing in the B direction, what is the direction of the magnetic field vector at that same point?
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3. [10] A light ray is incident onto an interface between two different materials at an angle of 30° to the normal at that point. Suppose, as shown, that the ray is incident in a material with 1.80 and the other side of the interface has 1.20, striking at the point where the dot is. Show the normal to the interface and that point.
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S2003-Exam3 - PHYSICS 112 - SPRING 2003 - EXAM 3 SHOW YOUR...

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