hysics 212 Spring 17 omework2 Electric Charge and Elect Item 8 tem 8 A proton is

Question

hysics 212 Spring 17 omework2 Electric Charge and Elect Item 8 tem 8 A proton is traveling horizontaly to the right at 4.90x108 session masteringphysics.com Mastering Physics: Homework 2: Electric charge and Electric Field Find (athe magnitude and (b direction of the woakest electric field that can bring the proton uniormy sorest ovo E. 392x108 N/C Submit My Answers Give Up Correct Part B 1800 counterclockwise from the left direction Submit My Answers Give Up Incorrect; Try Again; 2 attempts remaining Part c How much time does it take the proton to stop after entering the feld? My Answers Glyt

Explanation / Answer

initial speed , u = 4.90 *10^6 m/s

part B) as the proton is travelling to the right ,

the electric field must point towards left.

hence , 0 degree from left direction

part C)

let the acceleration of the proton is a

a = 3.92 * 10^6 * 1.602 *10^-19/(1.67 *10^-27)

a = 3.755 *10^14 m/s^2

time taken to stop = u/a

time taken to stop = 4.90 *10^6/(3.755 *10^14)

time taken to stop = 1.305 *10^-8 s

part D)

for the electric field is E

using work energy theorum

0.5 * 9.11 *10^-31 * (4.90 *10^6)^2 = 1.602 *10^-19 * E * 0.032

solving for E

E = 2133.4 N/C

the electric field needed is 2133.4 N/C

part E)

the direction of electric field is 180 degree from left direction

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