Marty is developing a new way to heat an airplane's windshield to prevent it from accumulating ice when in flight. a thin layer of clear, conductive material is injected between two layers of thick windshield plastic. a very small electric current is run through the inner material to keep the plastic layers warm. how might using a model marty develop his design? a. marty could use a model to discover a new type of plastic for windshields. b. airplane manufacturers could be sold models to use in their new planes. c. a model could be used to test his design in a lab. d. a model could be used for automobile windshields.

Intro: a solid ball of radius rb has a uniform charge density ρ. part a: what is the magnitude of the electric field e(r) at a distance r> rb from the center of the ball? express your answer in terms of ρ, rb, r, and ϵ0. part b: what is the magnitude of the electric field e(r) at a distance r express your answer in terms of ρ, rb, r, and ϵ0. part c: let e(r) represent the electric field due to the charged ball throughout all of space. which of the following statements about the electric field are true? check all that apply. e(0) = 0 e(rb)=0 limr→∞e(r)=0 the maximum electric field occurs when r=0 the maximum electric field occurs when r=rb the maximum electric field occurs as r→∞.