Download is the accelerating voltage of 1000 V)

Physics 30 - Concept Check 10 - Charge to Mass Ratio
1.
A proton passes undeflected through perpendicular electric and magnetic fields. The
electric field strength is 120 N/C and the magnetic field strength is 0.45 T. What is the
speed of the proton?
2.
If an electron were to pass through the same two fields in question one, would it still
pass through undeflected?
It still would as
We can see that the q is not necessary in the equation.
3.
An alpha particle accelerates through a potential difference of 1000 V. It then passes
into a region of perpendicular electric and magnetic fields. If the electric field is
generated by two parallel plates separated by 2.0 cm, what would the voltage between
the two plates have to be so that the alpha particle passes through undeflected in a
magnetic field of 0.92T?
; ​need to find
, and
, and
Which we get by equating potential energy lost to kinetic energy
gained by the alpha particle. (V​accel​ is the accelerating voltage
of 1000 V)
therefore
V = 5.7 x 10​3​ V
4.
If the alpha particle in question three then enters a different magnetic field of 0.50 T,
what would be its radius of curvature?
5.
An unknown particle travelling at 1.67 x 10​6​ m/s enters a magnetic field of 0.780 T and
travels in a circular path of 4.45 cm. What type of particle could this be?
Which corresponds to the charge to mass ratio of an alpha partice.