The figure shows a velocity selector that can be used to measure the speed of a

Question

The figure shows a velocity selector that can be used to measure the speed of a charged particle. A beam of particles is directed along the axis of the instrument. A parallel plate capacitor sets up an electric field E, which is oriented perpendicular to a uniform magnetic field B. If the plates are separated by 2 mm and the value of the magnetic field is 0.6 T, what voltage between the plates will allow particles of speed 6 x 10*m/s to pass straight through without deflection? A) 600 V B) 720 V C) 1900 V D) 190 V E) 94 V Tube (cutaway xxkxx B (into paper) Capacitor plates

Explanation / Answer

voltage between the plates is

V = Blv

here B = 0.6 T

l = 2*10^-3 m

v = 6*10^5 m/s

V = 0.6*2*10^-3*6*10^5

V = 720 V

option B

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