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S2004-Exam2

# S2004-Exam2 - PHYSICS 112 SPRING 2004 EXAM 2 NO CALCULATORS...

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PHYSICS 112 - SPRING 2004 - EXAM 2 NO CALCULATORS. 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. 1. (12 points) For the circuit shown, determine the equivalent resistance of the circuit and all the currents, potential differences, and powers, filling them in the table below; the equivalent resistance goes in the lower left box in the table. 1 2 4 V M Z T ? H H H 7 10 22 V H H

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2. (14 points) A circuit is shown which consists of one battery and three resistors. Only partial information is known: the current at two points, the potential at two points, and one resistance. Determine the rest of the resistances and currents, as well as the voltage of the battery, and fill out the rest of the table below (including the powers). Check your results. 3 1 A V M Z T ? H
3. [6 points] In a certain region of space there is a uniform horizontal magnetic field of F t magnitude 0.20 T pointing towards the south. (a) A vertical wire 2.0 m long is carrying a current of 6.0 A in the bottom-to-top direction. Determine the magnitude and direction of the magnetic force on the wire. (b) An electrically charged object with a charge of 6 C is moving up ( ) with a speed . of 40 m/s in this region. Determine the magnitude and direction of the magnetic force @ œ on the charge.

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4. (8 points) A square current loop is lying in the plane of the paper, with current as indicated. The loop lies in a uniform external magnetic field directed to the left, as F t shown. Determine the direction of the force on each side of the current loop (indicate with arrows, or ).
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