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Unformatted text preview: Hwk 1 Solutions PHYS 142 Summer ’09 Dr. Jenkins Question 32.1 A coil of wire always has an inherant inductance value, just as a capacitor always has a capacitance, even if the inductor isn’t affecting in the circuit; the value is dependent only on the geometry of the coil. That said, once the current reaches its max value, the inductor is no longer producing any emf or affecting the current value. Question 32.7 Since the circuit runs for a long time before the switch is moved to b , the current in the circuit will be the steady state values given by Ohm’s law (i.e. with no effect from the inductor); at this point, the potential across the 12Ω resistor is very nearly 12V. After the switch is thrown, the ”inertia” of the inductor will maintain the current value momentarily as the current begins to exponentially decay. Therefore, right after the switch is closed, the value of V 12Ω is the same as it was before the switch was thrown, but the value of V 1200Ω is, again by Ohm’s law, much larger. The potential across the inductor at this point will be equal tois, again by Ohm’s law, much larger....
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