P-09 c.Secure Ihttps//loncapa Apps FSU Libranet @eyeSU. Cerhal Au! Corey George
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P-09 c.Secure Ihttps//loncapa Apps FSU Libranet @eyeSU. Cerhal Au! Corey George Fuller (Student section: 3) PHY 2049c - Gen Physics n (Fall 2017 Sections 2-5) Course Contents , ...-6-potential 11 . MvngProtonin. Elect,-M Moving Proton in an Electric Field Part A lar to the face of a large plate that has a uniform harge density of . +9.90 C/m2. what is the magnitude ofthe force on the preten? | Submit Answer! Tries5 Part B How much work must the electric field do on the proton to bring it to rest? Submit Answer Tries 0/1is Part C From what distance should the proton be fired so that it stops right at the surface of the plate? ubmtAer Tries o/ss © 1998-2017 by Florida State University. All rights reserved The contents of this web site are for use by the students enrolled in this course only. Any distribution of the contents i, whole or in p ts and in any frm, including posting on the eb or i, printed version Post DiscussionExplanation / Answer
as a matter of fact the strength of homogeneous lectric field of our plate is E=0.5*p/eps, where given p=9.90e-6 C/m^2, eps =8.854e-12;
so a proton with kin energy w=2.85e5 eV =2.85e-5 *1.6e-19 J will undergo a force F=e*E decelerating it, where e=1.602e-19 C is its charge;
1) F=e*E =1.602e-19 C * 0.5 *9.90e-6 /8.854e-12 =8.956e-14 N;
2) work =w =2.85e5 *1.6e-19 =4.56e-14 Joules;
work done by the field is w= F*x, where x is the distance in question;
thus 3) x= w/F =4.56e-14 / 8.956e-14 = 0.50 m;
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