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Question:

A science-fair radio uses a homemade capacitor made of two 39.51 cm × 39.51 cm sheets of aluminum foil separat?

A science-fair radio uses a homemade capacitor made of two 39.51 cm × 39.51 cm sheets of aluminum foil separated by a 0.51-mm-thick sheet of paperWhat is its capacitance?

Answer:

(1) heavy metal (2) pollution
Black SabbathBut why do you call it pollution?
The relative permittivity (Er) of paper will be between 1.5 and 3 (see first link), so use an average of about 2.2 (Wikipedia reckons 3.85 in the link below but that is too high in my view) So the capacitance C is C EoErA/d C 8.8510^-12 2.2 (0.3951)^2 / 5.110^-4 F C 5.96 10^-9 F C 5.96 nF

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