Can someone please help me with this? I\'ve been working on it all week, the las

Question

Can someone please help me with this? I've been working on it all week, the last several hours and I can't get it and it's due in 90 minutes
The deflection of the electron beam in an old-fashioned tube TV set is accomplished by magnetic forces. Each electron is accelerated through a potential difference of V=45000V. What magnetic field is required to produce a deflection of y1=0.025m if the magnetic field region is x1=0.06m long? The charge to mass ratio of the electron is 175824175824.176C/kg. Whhat is B?
If there is a x2=0.18m gap between the end of the magnetic field region and the end of the tube, how far from the center of the screen does the beam strike?
ynet = y1 + y2 =

some of the equations i've tried: F=ma=eVB, (1/2)mv^2 = -qV, Q/M, F=IlB, I'm really confused so any help would be appreciated.

Explanation / Answer

you have to use vectors for doing this problem. The reason for this is that the force due to magnetic field here is no along the direction of velocity. Still, I explain in some simpler terms. The magnetic field exerts force in the direction perpendicular to the velocity. In this case the particle will move in an arc of circle with constant speed. The radius of circle will depend on the magnetic field and charge to mass ratio. R = mv/eB you want deflection of 0.025 m and magnetic field region's length is 0.06 m. Use the equation of circle and put the values. try it

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