You and your fellow students have been challenged to design a rubber band powered car. You will use the elastic potential energy of the rubber band to move the car a distance. The car that moves the greatest distance is the winner of the challenge. Each student is given the same size rubber band, wheels and axles. It is up to each student to design a car they consider the most efficient car. Predict which car should move the greatest distance. Explain your choice.

A) Less drag.

B) Closed roof.

C) Convertible.

D) Compact design.

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→∞.