• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Determine the deflection angle of a pellet

  • Thread starter jpnnngtn
  • Start date

jpnnngtn

A plastic pellet has a mass of 7.5 X 10^-10 kg and carries a charge of 2.00 X 10^-9 C. The pellet is fired horizontally betweenm a pair of oppositely charged parallel plates. If the electric field strength between the plates is 9.20 X 10^4 N/C and the pellet enters with an initial speed of 150 m/s, determine the deflection angle.

This is the diagram

+ + + + + + + + + + + + + + +

Q+ -------------------------------
\deflection angle(not sccurate drawing)
\
- - - - - - - - - - - ------ - - -
| <-- 2.0cm ----------------->|


*I am almost positive that this problem can be solved by taking the arctan of the change in X over the change in y but i am not sure how to get there. Not in this sense anyway. I can solve these sort of problems when they are not part of electricity.
 
Last edited by a moderator:
52
0
You know that by entering the electric field, the pellet will experience a force. If I understood the problem correctly the force will be perpendicular to the travel direction of the pellet.

The time spent btw the capacitor can be found; distance/velocity = 2 cm/150

The force can be found since E=F/q

Solve for the force.

F=ma

solve for acceleration

you know the amount of time it has accelerated as well as the value of the acceleration, therefore solve for the distance that the pellet has traveled in the verticle direction.

Now make a triangle. Verticle value being the value above, horizontal value being 2 cm. Find the angle of this triangle and there you go.
 
95
0
The pellet follows a parabola, not a straight line so you must get the arctan of vy over vx.
 

Related Threads for: Determine the deflection angle of a pellet

  • Posted
Replies
3
Views
16K
  • Posted
Replies
1
Views
1K
  • Posted
Replies
10
Views
2K
  • Posted
Replies
2
Views
2K
  • Posted
Replies
3
Views
6K
  • Posted
Replies
1
Views
836
  • Posted
Replies
4
Views
1K
  • Posted
Replies
4
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top