A commercial capacitor is constructed as in Figure 16.25aThis particular capacitor is made from a strip of aluminum foil separated by two strips of paraffin-coated paperEach strip of foil and paper is 3.00 cm wideThe foil is 0.00400 mm thick, and the paper is 0.025 mm thick and has a dielectric constant of 3.7What length should the strips be if a capacitance of 6.00 10-8 F is desired before the capacitor is rolled up? (Use the parallel-plate formulaAdding a second strip of paper and rolling up the capacitor doubles its capacitance by allowing both surfaces of each strip of foil to store charge.)I have no idea how to do this, I would really like to understand the steps, please if you don't mind show me the stepsThanks!
It doesn't matter how you wrap the potatoShiny vs dull would only apply to radiant heat like from a hot lamp or when exposed to the heating elements of an electric oven and would have no effect in a gas ovenOn side is shiny and the other side dull is because of the manufacturing process.
So you know what side to put on the outsideLOL The shiny side is slightly better reflector of heatFace that side of the foil in the appropriate directionTo keep things cold, put the shiny side on the outside - that will reflect incoming heatTo keep things warm, face the shiny side inward toward the hot food - to reflect the heat that is trying to escape back into the foodNote that people often bake potatoes with the shiny side out - that is because it makes for a better (prettier) presentationIn reality, baking them that way reflects the incoming heat on the outside, slightly slowing the cooking processOf course, in reality, which side of the foil faces where makes little differenceIt does make for lively conversation, though.
reflect heat better / for the same reason we have heads and tails on a coin, so u know which side is up! to annoy the neighbors with the reflection of the sun when you put it up in your windowthe shiny side is for cooking hot dogs on a sunny day!
For a pocket stew the dull side is on the outside to absorb the heat and the shiny side is on the inside to keep reflecting the heat into the stewFor a kite flying at night that might be reported as a UFO I would recommend shiny side at the front.
You need to know the formula to calculate the capacitance of a parallel plate capacitor: Capacitance Permittivity x Area / thickness (Where permittivity permittivity of free space x dielectric constant) Rearrange the formula so that you can calculate the area of the platesDivide the area by the width to get the length requiredThe thickness you need in the equation is the thickness of the paper, the thickness of the plates makes no difference(Convert the dimensions to metres fist so that you are working in SI units)
