Solving for Ey in a Region with Electric and Magnetic Fields

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A charged particle with a charge of +2.7 µC moves at 50 m/s in a region with a magnetic field of 3.4 T directed in the +z direction. The participant is trying to determine the Ey component of the electric field, given that Ex and Ez are zero. They are advised to use the Lorentz force law, which combines electric and magnetic forces acting on the particle. Additionally, there is a question about the required electric field for a particle with an opposite charge to maintain straight-line motion in the same magnetic field. The discussion highlights confusion over whether an existing electric field is present or if an external field is needed for the desired motion.
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megnetic force problem help please

A charged particle (q = +2.7 µC) moves at speed v0 = 50 m/s in the +x-direction. At x = 0 it enters a region where a constant magnetic field B = 3.4 T is directed in the +z direction ?

What are the component of electric field ?

i got the Ex and Ez which are Zero .. but i can;t figure out the Ey ?

so
(a) what is Ey ?

here are the some hint :
Use the Lorentz force law for the net force on a charged particle in a region containing both electric and magnetic fields. (The law is called the "electromagnetic force law" ). but i still can;t figure it out so please help me out with this . thank you

If the incoming particle were replaced by one with the opposite electric charge but the same initial velocity, what electric field would be required to ensure a straight line motion? (Magnetic field is unchanged.)

(b) again what is Ey' ?
 
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I think there is some information missing. Is an electric field already present?
 
Or maybe they are asking what external E field would result in the particle still moving at Vo only in the x direction?

vicks, can you please type out the question exactly as it is given to you?
 
I think it's equal to

=([dv/dt]*mass)/2.7

we aren't given either of them :(
 
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