in one type of computer keyboard each key holds a small metal plate th
In one type of computer keyboard, each key holds a small metal plate that serves as one plate of a parallel-plate, air-filled capacitor. When the key is depressed, the plate separation decreases and the capacitance increases. Electronic circuitry detects the change in capacitance and thus detects that the key has been pressed. In one particular keyboard,the area of each metal plate is 44.5 mm, and the separation between the plates is 0.71n mm before the key is depressed. Calculate the capacitance before the key is depressed. If the circuitry can detect a change in capacitance of 0.300 pF, how far must the key be depressed before the circuitrydetects its depression?
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