22.15 • (a) A conducting sphere has charge Q and radius R. If theelectric field of the sphere at a distance r = 2R from the cœnter of thesphere is 1400 N/C, what is the electric field of the sphere at r = 4R?(b) A very long conducting cylinder of radius R has charge per unitlength A. Let r be the perpendicular distance from the axis of the cyl-inder. If the electric field of the cylinder at r = 2R is 1400 N/C, whatis the electric field at r = 4R? (c) A very large uniform sheet of chargehas surface charge density o. If the electric field of the sheet has a valueof 1400 N/C at a perpendicular distancœ d from the sheet, what is theelectric field of the sheet at a distance of 2d from the sheet?22.21 •• The electric field at a distance of 0.145 m from the surface ofa solid insulating sphere with radius 0.355 m is 1750 N/C. (a) Assumingthe sphere's charge is uniformly distributed, what is the charge densityinside it? (b) Calculate the electric field inside the sphere at a distanceof 0.200 m from the center.

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Answered: 22.15 • (a) A conducting sphere has…

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