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Exam 2 practice problems

Exam 2 practice problems - Exam 2 practice problems 1 A...

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Exam 2 practice problems Physics 204 1. A current flows upward in a long straight wire. To the right is a rectangular loop that is also carrying a current (the power supply is not shown so the diagram doesn’t get too cluttered). Predict the magnetic force the straight wire exerts on the rectangular loop. 2. Two parallel wires are carrying currents as shown in the diagram. The electrons that make up the current 2 I move at a very slow average speed, in this case approximately 5 6.9 10 m s . a. Draw a picture of the magnetic field generated by 1 I . b. What is the magnitude and direction of the magnetic force, if any, that is exerted on one of the moving electrons in the wire on the right. 3. Imagine that a space mission has been planned to send a probe to the planet Mercury. One of the goals of the mission is to measure the magnetic field of the planet as a function of altitude above the north magnetic pole of the planet. To do this, the space probe is being designed with a ring made of 1000 turns of conducting wire. This ring has a radius of 2.00 m and a total resistance of 10.0 . As the probe descends this ring will be kept parallel to the surface of the planet. You estimate that the probe will take 300 seconds to descend from orbit (where the magnetic field is zero) to the surface (where the magnetic field has an approximate magnitude of 5 10 T ). Predict the current that will flow in the ring as the probe descends to the surface. 4. A square loop of wire (of negligible resistance) is connected to a light bulb that has a resistance of 10.0 . The magnetic field within the loop is uniform and points perpendicular to the plane of the loop. A graph of the magnetic field is shown (positive values mean the magnetic field points out of the page.) Draw a graph showing the current flowing through the light bulb as a function of time. When there is a current, if ever, predict its value and direction. 10.0 cm 1 2.00 I A 2 3.00 I A

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5. You are at a bowling alley picking out the ball you are going to use when you see a highly polished silver colored ball. When you reach down to pick it up you see an image of yourself created by its shiny surface. a. Qualitatively, where is this image located and what are its properties (magnified/demagnified, upright/inverted, etc.)? Include a ray diagram to support your answers. b. If the radius of the ball is 15.0 cm and your face is 35.0 cm from the surface of the ball, numerically determine the location and magnification of the image. 6. You are a safety inspector hired by the Princeton Plasma Physics Laboratory to determine if their new experimental nuclear fusion reactor is generating too strong a magnetic field in nearby offices. You go to the office nearest the experiment which turns out to be directly above the main fusion reactor.
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