(8c25p24) The figure shows a varable \"air gap\" capacitor of the type used in m

Question

(8c25p24) The figure shows a varable "air gap" capacitor of the type used in manually tuned radios. Alternate plates are connected together; one group is fixed in position and the other group is capable of rotation. Consider a pile of n = 5 plates of alternate polarity, each having an area A = 3.00

The figure shows a varable "air gap" capacitor of the type used in manually tuned radios. Alternate plates are connected together; one group is fixed in position and the other group is capable of rotation. Consider a pile of n = 5 plates of alternate polarity, each having an area A = 3.00 times 10^-2 m2 and separated from adjacent plates by a distance d = 2.40 times 10^-3 m. Compute the maximum capacitance.

Explanation / Answer

we have 4 capacitors in parallel

C=4KeoA/d

C=4*1*8.85*10^-12*0.03/0.0024

C=4.425*10^-10 F or 442.5 pF or 0.4425 nF

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