A beam of protons, each of which has mass m, and charge qe moving with a velocity V enters perpendicularly a uniform magnetic field with the magnitude B= 2uT directed into plane of the page. After the beam exits the magnetic field, leaving the field in a direction perpendicular to its original direction, the beam enters a uniform electric field with the intensity E = 2.10-8 V/m directed downward existing above a distance d=10 m. The beam travels a distance of 6 cm in the magnetic field. After the proton beam exits the magnetic field, what will be passing time till the proton beam stops in the electric field? (Neglect the effect of gravitation).
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