A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 V/m upward. If the beam enters the region at a height of 3.7 cm above the lower plate, at what height above the lower plate is the beam when it exits? The proton mass is

A. 4.4 cm
B. 3.0 cm
C. 5.1 cm
D. 2.3 cm


A. 4.4 cm

Physics & Space Science

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