su11EIIS - Physics 54 Summer 2011 Exam II Solutions Part A...

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Exam II Solutions Part A: Multiple choice questions, 4 points each. Check the best answer. 1. In the circuit shown, after the switch is closed the current through the 12 V battery is: 1 A to the right. 2 A to the left. 2 A to the right. [The currents in the other two branches must be 1 A to the left.] Zero. [Consider the potential difference across the horizontal branches.] 2. Two parallel straight wires carry equal currents as shown. The B-field at a point halfway between them is zero. They repel each other. The B-field at a point above the top wire is directed into the page. The B-field at a point below the bottom wire is directed into the page. 3. Which of the following is wrong? Lines of B always form closed curves. A B-field changing with time causes an E-field. Lines of E never form closed curves. [Lines of induced E-fields do.] The energy density is proportional to the square of the field magnitude for both E and B . 12 V 10 V 2 Ω 12 Ω Physics 54 Summer 2011 1
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4. A copper plate rests on a frictionless table; a bar magnet a small distance above it moves to the right, as shown from above. In case A the magnet moves into the space directly above the plate; in case B it moves away from that space. The plate accelerates to the right in both cases. [Force opposes relative motion.] The plate accelerates to the left in both cases. The plate accelerates to the right in case A and to the left in case B. The plate accelerates to the left in case A and to the right in case B. Part B: True-false questions, 3 points each. Check the correct answer.
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