5407Exam2Blank

5407Exam2Blank - Physics 54 S07 Exam 2 Name Part I: Short...

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Physics 54 S07 Exam 2 Name Section: Part I: Short Answer (3pts each) Circle the correct answer: 10 A 5 A P 1) At the point P in between two wires, the magnetic fields from each of the two wires: a) add and give a net field out of the page. b) add and give a net field into the page. c) subtract and give a net field out of the page. d) subtract and give a net field into the page. R + - 10V I 12 2) A 10 volt battery is connected to a resistor. The resistor overheats, causing the resistance to increase and the current I to decrease rapidly. The currents induced in loops 1 and 2 a) are clockwise in loop 1 and counterclockwise in loop 2. b) are counterclockwise in loop 1 and clockwise in loop 2. c) are clockwise in loop 1 and clockwise in loop 2. d) are counterclockwise in loop 1 and counterclockwise in loop 2.
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3V 3) Three volts alternating voltage is applied to the primary winding of a transformer. The primary has 100 turns and the secondary winding has 500 turns. 2 A is flowing the primary. a) The voltage in the secondary is 0.6 V and the current is 10 A. b) The voltage in the secondary is 15 V and the current is 0.4 A. c) The voltage in the secondary is 0.6 V and the current is 0.4 A. d) The voltage in the secondary is 15 V and the current is 10 A. E B 4) An electromagnetic wave has an electric field in the positive z-direction and a magnetic field in the positive y-direction.
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This note was uploaded on 05/13/2010 for the course PHYSICS 54L taught by Professor Thomas during the Spring '09 term at Duke.

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5407Exam2Blank - Physics 54 S07 Exam 2 Name Part I: Short...

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