A physicist wants to study the motion of a car. a. The physicist measures how long it takes a car to go 50 miles. How many
kilometers is this? (Note: 1 mi = 1.61 km)

b. In another experiment, the car travels 22.3 miles. How many yards is this?
(Note: 1 mi = 5280 ft; 1 yd = 3 ft)

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→∞.