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# An inventor has a rough design for a light fixture with a dimmer kno.docx

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?
.

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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### An inventor has a rough design for a light fixture with a dimmer kno.docx

1. 1. 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?