Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping
tanya tandon Grade: 11
        A proton has an initial velocity of 3.82x10^7 m/s in the horizontal direction. It enters a uniform electric ?eld of 20000 N/C directed vertically. Ignoring gravitational e?ects, ?nd the time it takes the proton to travel 0.066 m horizontally. What is the vertical displacement of the pro- ton after the electric field acts on it for that time? What is the proton’s speed after being in the electric field for that time?
8 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points

Dear tanya

since no force in the horizontal direction so horiizonta velocity will reamain constant Vx = 3.82x107 m/s


so time taken to travel 0.066 m horixontally is  t = .066/3.82x107 = 1.73  X 10-9 s


charge of the proton is q = 1.6 * 10-19C

mass  of the proton is m = 1.67 * 10-27 kg

given E =20000 N/C

 acceleration of proton in vertical direction  a=qE/m

                                                                               =1.916 * 1012  m/sec2


vertical distance moved by proton  h= 1/2  at2

                                                                   =1/2  * 1.916 * 1012 *(1.73  X 10-9)2

                                                                   =2.867 * 10-6 m

 vertical velocity of proton after time  t   Vy= at

                                                                            =1.916 * 1012 *(1.73  X 10-9)

                                                                             =3.315 * 103 m/sec

so resultanat velocity will be  = √Vx2 + Vy2


Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed  solution very  quickly.

 We are all IITians and here to help you in your IIT JEE preparation.

All the best.
Askiitians Experts


8 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete Physics Course - Class 12
  • OFFERED PRICE: Rs. 2,756
  • View Details
  • Complete Physics Course - Class 11
  • OFFERED PRICE: Rs. 2,968
  • View Details

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details