PHY 213. General Physics II Test 2.
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1 Univesity of Kentucky Depatment of Physics an Astonomy PHY 3. Geneal Physics Test. Date: July, 6 Time: 9:-: Answe all questions. Name: Signatue: Section: Do not flip this page until you ae tol to o so. nstuctions: This is a close book, close notes test. Please tun off all electonics evices except you calculato. Pogamming function of calculato is not allowe. Poblems -6. points each. icle the answe if it is a multiple choice question. Show you wok in etail fo poblem 7 an 8. 3 points each. Useful constants: Gavitational constant = Nm kg - ε = Nm - k=/(4ε)= Nm - Electon chage =.6-9 Electon mass = kg Poton mass = kg (Do not wite below) Poblem No. Scoe Total / Page of 8
2 . A ca battey has an intenal esistance of =. Ω. t is connecte to a state equiing = 8 A an it has an intenal EM of ε =. What is the voltage acoss the two teminals? A....8 D.. E..8. ou wies caying the same magnitue of cuent ae aange in the cones of a squae as shown in the pictue. Magnetic fiel in the cente of the squae is iecte towas: A. Noth. West. South D. East E. Zeo W N E 3. The magnetic fiel at the cente of a solenoi L = 5 cm long is =.5 Teslas when a cuent of = A flows though the solenoi wie. What is the numbe of tuns in the solenoi? A tuns tuns tuns D. 398 tuns E. All of above ae moe than 3% off fom the tue value. S 4. onsie the magnetic fiels an velocity of a positively chage paticles shown in the figue. What is the iection of the magnetic foce on the chage paticle? A... D. E. no foce v Page of 8
3 5. A negative chage of q = - -7 an m = 3-6 Kg entes a magnetic fiel =.5 T as shown in the figue. The magnetic fiel points into the pape. Once entes the magnetic fiel the paticle uns in small cicle of aius =.7mm. What is its spee an the iection of tavel in the cicle? A. 7 4 m/s ounteclockwise. 7 4 m/s lockwise. 3 4 m/s ounteclockwise D 3 4 m/s lockwise E. All of above ae moe than 3% off fom the tue value. 6. The figue shows a coss section of thee long staight cuent caying wies. Notice we ae using the common convention that cosses enote vectos going into the page an ots enote vectos coming out of the page. in the iection of the foce acting on wie A if all wies cay the same magnitue of cuent. cm A... A cm D. E. no foce Page 3 of 8
4 7. An electon beam is shot into a egion whee thee is both a unifom electic fiel pointing upwa of magnitue E = 5 N/, an a unifom magnetic fiel (not shown). While moving though the egion the electon beam stays in a staight line if the magnitue of the magnetic fiel is T. gnoe weight in this poblem. electon (a) ( points) o this pat of the poblem, use lettes to epesent iections as follow: A... D. E.. G. H.. J. K. n which iection oes the electic foce act on the electons? hoose one of A to K as you answe. Answe: n oe to keep the electons in a staight line, in which iection shoul the magnetic foce act? Answe: n oe to keep the electons in a staight line, which iection shoul the magnetic fiel go? hoose one of A to K as you answe. Answe: (b) (5 points) alculate the magnitue of the electic foce E acting on the electon. Page 4 of 8
5 (c) (3 points) Wite own the equation of motion fo the electon an then solve fo the spee of the electon. Page 5 of 8
6 8. onsie the cicuit iagam as shown in the figue. =3 (a) (5 points) alculate the effective esistance of the thee esistos. =9 3 3 =7 3 5 (b) (5 points) alculate the cuent fom the battey. (c) (5 points) alculate the voltage acoss the 9 esisto (). Page 6 of 8
7 () (5 points) alculate the cuent though the 3 esisto (). (e) (5 points) alculate the powe issipate by the 7 esisto (3). (f) (5 points) alculate the powe elivee by the battey. \ Page 7 of 8
8 Page 8 of 8 3 S 3 P G U A q U E 4 4 E qe 4 v a mgy U mv K P A nev A L 3 P 3 S v L NA sin E v q mv sin qv sin n H Useful constants: Gavitational constant = Nm kg - ε = Nm - k=/(4ε)= Nm - Electon chage =.6-9 Electon mass = kg Poton mass = kg = 4-7 TmA - Useful fomulae: \
ev dm e evd 2 m e 1 2 ev2 B) e 2 0 dm e D) m e
. A paallel-plate capacito has sepaation d. The potential diffeence between the plates is V. If an electon with chage e and mass m e is eleased fom est fom the negative plate, its speed when it eaches
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