Chapt_33

# Chapt_33 - University Physics(Prof David Flory Chapt_33...

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Unformatted text preview: University Physics (Prof. David Flory) Chapt_33 Monday, August 06, 2007 Name: __________________________ Date: _____________ ___ 1. A series RL circuit is connected to an emf source of angular frequency ω . The current: A) leads the applied emf by tan –1 ( ω L / R ) D) leads the applied emf by tan –1 ( ω R / L ) B) lags the applied emf by tan –1 ( ω L / R ) E) is zero C) lags the applied emf by tan –1 ( ω R / L ) ___ 2. A current of 10 A in a certain inductor results in a stored energy of 40 J. When the current is changed to 5 A in the opposite direction, the stored energy changes by: A) 20 J B) 30 J C) 40 J D) 50 J E) 60 J ___ 3. In a purely inductive circuit, the current lags the voltage by: A) zero D) three-fourths of a cycle B) one-fourth of a cycle E) one cycle C) one-half of a cycle ___ 4. An LC circuit has a capacitance of 30 μ F and an inductance of 15 mH. At time t = 0 the charge on the capacitor is 10 μ C and the current is 20 mA. The maximum charge on the capacitor is: A) 8.9 μ C B) 10 μ C C) 12 μ C D) 17 μ C E) 24 μ C ___ 5. A resistor, an inductor, and a capacitor are connected in parallel to a sinusoidal source of emf. Which of the following is true? A) The currents in all branches are in phase. B) The potential differences across all branches are in phase. C) The current in the capacitor branch leads the current in the inductor branch by one-fourth of a cycle D) The potential difference across the capacitor branch leads the potential difference across the inductor branch by one-fourth of a cycle. E) The current in the capacitor branch lags the current in the inductor branch by one-fourth of a cycle. Write the letter for the correct answer on the answer sheet. Write clearly. Page 1 University Physics (Prof. David Flory) Chapt_33 Monday, August 06, 2007 ___ 6. The graphs show the total electromagnetic energy in two RLC circuits as functions of time. Which of the following statements might be true? A) Circuit 1 has a smaller resistance and a larger inductance B) Circuit 1 has a larger resistance and a smaller inductance C) Circuit 1 has the same resistance and a larger inductance D) Circuit 1 has a larger resistance and a larger capacitance...
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Chapt_33 - University Physics(Prof David Flory Chapt_33...

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