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# HW18soln - Physics 21 Fall 2007 Solution to HW-18 YF...

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Physics 21 Fall 2007 Solution to HW-18 YF 30-27 (Modified) An inductor with an inductance of 2.80 H and a resistance 7.50 is connected to the terminals of a battery with emf of 6.20 V and negligible internal resistance. (A) What is the power in-put to the inductor from the battery as a function of time t in seconds if the circuit is completed at t = 0? (B) What is the rate of dissipation of energy in the resistance of the inductor as a function of time t in seconds? (C) What is the rate at which the energy of the magnetic field in the inductor increases as a function of time t in seconds? 30-28 A 21.0 μ F capacitor is charged by a 135.0 V power supply, then disconnected from the power and connected in series with a 0.270 mH inductor. (A) Calculate the oscillation frequency of the circuit. (B) Calculate the energy stored in the capacitor at time t = 0 (the moment of connection with the inductor). (C) Calculate the energy stored in the inductor at t = 1.30 ms.
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