4) an electron moving along the +x-axis enters a magnetic field. if the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component

(a) along the +z-axis.

(b) along the -z-axis.

(c) along the -x-axis.

(d) along the +y-axis.

(e) along the -y-axis.

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Aturntable that spins at a constant 74.0 rpm takes 3.10 s to reach this angular speed after it is turned on. find its angular acceleration (in rad/s2), assuming it to be constant, and the number of degrees it turns through while speeding up.

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→∞.