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Electromagnetism: Moving Charge in a Magnetic Field

Q- In an experiment with cosmic rays, a vertical beam of particle that have charge of magnitude 3e and mass 12 times the proton mass enters a uniform horizontal magnetic field of 0.250 T and is bent in a semicircle of diameter 95.0 cm as shown in the diagram 

(a) Find the speed of the particles and the sign of their charge.

(b) Is it reasonable to ignore the gravity force on the particles?

(c) How does the speed of the particles as they enter the field compare to their speed as they exit the field.

Solution:

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