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F09 - Exam 2(1)

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

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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) ( ) 1 2 2 / 2 r ε ε ε C) 2 1 / r ε D) ( ) 1 2 2 / r ε ε ε E) 2 1 / 2 r ε 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: Version 1 Page 1

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

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