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 1.67 $\times$ 10^-27 kg. A) 4.4 cm B) 3.0 cm C) 5.1 cm D) 2.3 cm

Question

Quizplus · Accepted Answer

The vertical acceleration of the protons due to the electric field is calculated using F = ma = qE, where q is the charge of a proton. The time to travel the length of the plates is found using the horizontal velocity. Using the vertical acceleration and time, the vertical displacement is calculated and added to the initial height.

A Horizontally-Projected Beam of Protons Travelling at 55 Km/s Travels ×\times×

A Horizontally-Projected Beam of Protons Travelling at 55 Km/s Travels $\times$