F09 - Exam 2(1)

F09 - Exam 2(1) - 1. The positive terminals of two...

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1. The positive terminals of two batteries with emf's of ε 1 and ε 2 , respectively, are connected together. Here ε 1 > ε 2. The circuit is completed by connecting the negative terminals to each other. If each battery has an internal resistance of r , the rate at which electrical energy is converted to chemical energy in the smaller battery is: A) 2 2 /2 r ε B) ( ) 12 2 r εεε C) 2 1 / r D) ( ) 2 / r E) 2 1 r 2. A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.7 T uniform magnetic field is parallel to the hypotenuse. The total magnetic force on the two sides has a magnitude of: A) 0.21 N B) 0.51 N C) 0.41 N D) 0 E) 0.30 N 3. A portion of a circuit is shown, with the values of the currents given for some branches. What is the direction and value of the current i ? A) , 2A B) None of these C) , 1A D) , 2A E) , 1A 4. You wish to triple the rate of energy dissipation in a heating device. To do this you could triple: A) the resistance keeping the potential difference the same B) the potential difference keeping the resistance the same C) both the potential difference and current D) the current keeping the resistance the same E) the resistance keeping the current the same Version 1 Page 1
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5. In the diagrams, all light bulbs are identical and all emf devices are identical. In which circuit (I, II, III, IV, V) will
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This note was uploaded on 09/05/2011 for the course PHYS 116b taught by Professor Haglund during the Spring '07 term at Vanderbilt.

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F09 - Exam 2(1) - 1. The positive terminals of two...

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