Question 2 only 1. Cecil, Gretta, and Buster are trying to make their own coaxia

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Question 2 only

1. Cecil, Gretta, and Buster are trying to make their own coaxial cable to tap into Mark's home theatre so that they can show bootleg movies in the doghouse in the backyard. Cecil plans on charging the neighborhood dogs to come over and watch their unauthorized screenings of various dog-favorites like Old Yeller, Cujo, and Homeward Bound. Help Cecil determine the capacitance per unit length of a cylindrical capacitor of inner radius Ra, outer radius Rb, and length L> Ra -Ro Gretta is taking their ill-gotten earnings to decorate the doghouse. She is putting up a hollow, metal disco ball of radius, R. If the outside is carrying charge, Q, determine the electric potential both inside and outside the sphere 2. 3. Buster is in charge of wiring up the dog's new theatre system (because Cecil and Gretta would rather he be electrocuted than either of them). Help Buster figure out what the effective capacitances are for the following circuits A/3 A/3 A/3 k1 d/3 d/3

Explanation / Answer

2)

The use of Gauss' law to examine the electric field of a charged sphere shows that the electric field environment outside the sphere is identical to that of a point charge. Therefore the potential is the same as that of a point charge:

So, electric potential, V = (1/ 4O) (Q/R)

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