Proton in magnetic and electric field

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SUMMARY

The discussion centers on the motion of a proton in a combined magnetic field (B) and electric field (E). The proton, moving in the +x direction, requires an electric field oriented in the -y direction to remain un-deflected. This conclusion is derived from the equation qE = qVB, where the forces exerted by the magnetic and electric fields must balance. The Right-Hand Rule (RHR) was applied, leading to the determination that the electric field must oppose the magnetic force acting on the proton.

PREREQUISITES
  • Understanding of electromagnetic forces, specifically Lorentz force.
  • Familiarity with the Right-Hand Rule (RHR) for determining force directions.
  • Knowledge of basic kinematics, particularly motion in electric and magnetic fields.
  • Proficiency in using the equation qE = qVB for force calculations.
NEXT STEPS
  • Study the application of the Lorentz force in different charge scenarios.
  • Explore the implications of electric and magnetic field orientations on particle trajectories.
  • Learn about the behavior of charged particles in uniform fields using simulation tools.
  • Investigate advanced topics such as cyclotron motion and magnetic confinement in plasma physics.
USEFUL FOR

Students and educators in physics, particularly those focusing on electromagnetism, as well as professionals working in fields involving charged particle dynamics and electromagnetic applications.

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Homework Statement




As shown in the figure below, a proton moves in the +x direction with speed v and is immersed in both, a uniform magnetic field, B, oriented in the -z direction, and a uniform electric field, E (not shown in the diagram). What electric field orientation is required in order for the proton to move un-deflected through the combined magnetic and electric field region?
(a) +y direction
(b) -y direction
(c) +z direction

Answer is B.

http://i.imgur.com/1G80T.png

1G80T.png


Homework Equations



qE=qVB

The Attempt at a Solution



I used RHR, I get answer A...
 
Physics news on Phys.org
Which way does the B field push on the proton?
Which way should the E field push on it?
 
Delphi51 said:
Which way does the B field push on the proton?
Which way should the E field push on it?

Which way does the B field push on the proton? Along x-axis
Which way should the E field push on it? Opposite direction of qvb?
 

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