Uniform electric and magnetic field

AI Thread Summary
A particle with an initial velocity of 6.00 x 10^3 m/s enters a region with uniform electric and magnetic fields, where the magnetic field is 0.300 T in the -y direction. To ensure the particle passes through undeflected, the electric field must be calculated using the Lorentz Force Law, F = qE + q(v x B). Participants discuss the relationship between electric and magnetic forces, suggesting that qE must equal -q(v x B) to achieve zero deflection. The conversation emphasizes the need to determine the appropriate electric field magnitude and direction for both positive and negative charge scenarios. The thread highlights the collaborative effort to solve the physics problem effectively.
aiika
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Homework Statement



a particle with initial velocity Vo=6.00 x10r^3 m.s-1 in the +x direction enters a region of uniform electric and magnetic fields. the magnetic field in the region is B=0.300 T in the -y direction. calculate the magnitude and direction of the electric field in the region if the particle passes through undeflected for a particle
a) +0.400x 10raise to -8 C
b)-0.400x 10 raise to -8 C

Homework Equations



can i use the Lorentz Force Law

F=qE+qvxB

The Attempt at a Solution



i'm stuck and i don't know how to start. HELP please.it will be higly appreciated :D

Thanks in advance
 
Last edited:
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welcome to pf!

hi aiika! welcome to pf! :smile:

(try using the X2 icon just above the Reply box :wink:)

Yes, use Lorentz Force …

how much does the qE have to be to cancel out the qvxB so as to produce a zero deflection? :smile:
 
hi there..i tried using this

qE=qvxB

hmmm..am i on the right track?:-p
 
wouldn't qE = -qvxB work better? :wink:
 
oh thanks!

so...

with qE what should i do next?
 
uhh? :confused:

get on with it!​
 

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