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 mV/m upward.If the beam enters the region at exactly midway vertically between the plates,and exits the region 7.2 microns closer to the lower plate,where relative to the lower plate would a beam of electrons - injected into the region at the same location - exit? The proton mass is 1.67 $\times$ 10^-27 kg and that of the electron is 9.11 $\times$ 10^-31 kg. A) 0.9 cm B) 5.1 cm C) 2.3 cm D) 4.6 cm

Question

Quizplus · Accepted Answer

The deflection of the beam is inversely proportional to the mass of the particle. Since the electron is much lighter than the proton, it will experience a greater deflection. The deflection is calculated using the formula for the force on a charged particle in an electric field and the kinematic equations. The electron will exit 4.6 cm closer to the lower plate.

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 $\times$