In an experiment with cosmic rays, a vertical beam of particles that have charge

Question

In an experiment with cosmic rays, a vertical beam of particles that have charge of magnitude 3 and mass 12 times the proton mass enters a uniform horizontal magnetic field of 0.250 and is bent in a semicircle of diameter 95.0 , as shown in Fig. E27.22 in the textbook. A) Find the speed of the particles. B) Find the speed of the particles. C) Is it reasonable to ignore the gravity force on the particles? D) How does the speed of the particles as they enter the field compare to their speed as they exit the field?

Explanation / Answer

A)

v = qBr/m = 1.6*10^-19*3*0.25*0.475/(12*1.67*10^-27) = 2.84*10^6 m/s <----answer

C)

Fb = qvB = 1.6*10^-19*3*2.84*10^6*0.25 = 3.41*10^-13 N

Fg = mg = very less than Fb

So, yes gravity can be ignored.....

D) Speed will remain same....

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