Question

5 Pts:Imagine a proton and an electron, each having an initial velocity of 1000 m/s in the +x-direction, enter a box that contains a number of charges. As they travel through this box, the potential difference they encounter decreases from 20 V to 10 V. Please note a proton is much more massive than an electron. Which of the following statements is FALSE. (a) (b) The proton exits the box at a greater speed than the electron. The magnitude of the change in electric potential energy is the same for both the electron and proton The magnitude of this change in speed is the same for both the electron and the proton The magnitude of the change in kinetic energv is the same for both the electron and the proton (c) (d) 5 Pts.Imagine a proton and an electron are subject to the same electric field. Please note that a proton is much more massive than an electron. forces on the electron and proton by that electric field? Which of the following is TRUE for the (a) (b) (c) (d) The magnitudes of the forces are the same, and the directions are the same The magnitudes of the forces are the same, but the directions are different The magnitudes of the forces are different, but the directions are the same The magnitudes of the forces are different, and the directions are different

Answer 1

1) u we know KE= e.V. where e= charge of electron & proton. - Potential - Imu?= ev (a) v aev , Now for proton Up = 2ev m у We & for electron Ve= (2ev me Potential Vis same, & mp me. = ve > Up option (a) is (false statement) (6) for both ) Electric potential energy = e.V. i V is same for both (changes from 20 to 10 both will have same change in potential energy option (h) is (true statement) both have same initial velocity but have different final velouty =) Magnitude of change in speed is different for both cases option (c) is (false statement)