Along, straight, solid cylinder, oriented with its axis in the z−direction, carries a current whose current density is j⃗ . the current density, although symmetrical about the cylinder axis, is not constant but varies according to the relationship j⃗ =2i0πa2[1−(ra)2]k^for≤a=0 for≥a where a is the radius of the cylinder, r is the radial distance from the cylinder axis, and i0 is a constant having units of amperes.

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet