An inventor has a rough design for a light fixture with a dimmer knob. The fixture contains a
50-µF capacitor, an inductor, and a 100-W light bulb (the resistor), forming a series RCL
circuit. The idea is that when the dial is set to MAX, the resonant frequency of the circuit is
60 Hz, the frequency of the standard household ac service in the US. Thus, the circuit is at
resonance, and the light bulb operates at 100 W.
Turning the dimmer knob down from MAX gradually pulls a thin cardboard sheet (? = 3.3) out
from between the capacitor’s plates, decreasing its capacitance and thereby changing the
circuit’s resonant frequency. This lowers the power output of the bulb, dimming it. When the
knob is turned to MIN, the cardboard sheet is completely out of the capacitor, and the bulb is
meant to be operating at just 40 W. (The OFF setting opens the circuit, but that’s unrelated to
the question.)
Question: will the fixture work as designed? If not, should a material with a higher or lower
dielectric constant should be used in constructing the capacitor?
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