Exam 2--Fall 2004 - 0h1prc,b2AA 4e&JL z06+ tloo\r\ Z on has...

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0h1prc,b 2AA 4e&JL z06+ tloo\r\ Z 1. A parallel-plate capacitor has a plate area of 0.2m2. lf the charge on each plate has a magnitud e of 4 x 10s C, the magnitude of the electric field (in V/m) between the plates is approximatelY --<\ ($)need to know the plate separation to solve -(o o '- 4xlo r tt=- ,Lm2 B. 43 x1A2 C. 1.0 x'l06 @ z.srtou E. 4.7 x1a12 / '- Lt) A & \ -11| O I s,ESxlo' lt*/ ^ \E\= 5q- Y'>'e.=;" \-nL, 6T.' Z. Two wires made of different materials have the same uniform current density. They carry the same onlY if: A. the potential differences across them are the same. B. the electric fields in C. their lengths are -1 -1 Jv ..e\ (9) tner cross-sectional areas E. both their and cross-sectional 3. In the circuit shown, what is the magnitude of the potential difference (in V) between ooints A and B? A. 15.0 \st ?_cL v,: A* --. .-\ <&.J*st c.5 D. 2.5 E.0 \2- t( r) = vo \T ?, =vo t.) - ts (?r) " l- uv-.- 3 lO - Ir- l,l - {;.,-aL,=o '-ll , ; *1i^* o lo vL w''L A\ \L1 ,, VZ -, r'-? ln G d vl/ 7' 1Z v f A ,- ) (&=.6 Lt z, it," t/l- L
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4. At one instant an electron is moving in the xy plane. The components of the electron's velocity ?re V, = 5 x 105 m/s and v*:UOt m/s. A magnetic field of 0.87 is in the positive z direction. At that instant the magnitude of the magnetic force (in N) on the electron is r'-----:-:5\ (n. 7.s x 1o'o .) B. 6.4 x 10ra C. 5.1 x 10-14 D. 3.8 x 10*14 JGr,tr (r-"i;ry' ru: ,!,i\,u* r o,b I 5. Two capacitors with capacitances Cl=Q and Cz=2C are connected in series with a battery as shown. Capacitor C1 has voltage V. The battery emf A. 3V B. 2V D.V E. Vtz 6. The current density is the same in two wires, A and B. Wire A has half the free electron concentration of wire B. The drift speed of the electrons in A is: A. the same as that of electrons in B. B. one-fourth that of electrons in B C. half D. four times E, twiCe th;ff .l".tr"*--ilH} Cr cz rTF*\ L l" '] t L T -1 u F - uB / .\ .) t V{v# ntuoto tt,/ t-"a; Y-vi.v Vlo,= zudb
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t'q {2. In the circuit shown in the diagram, the four light bulbs all have the same resistance. ' Given that theUigbbggg is prop,orllon@, the brightness of B, C and-D together, coinparedlollie brightness of bulb A is P -V-1 7*"'"Y- pA. il^= 0., \('V- n', e {. c". D. E. -- CI u' ]or]".wdrct>+ 8, An electron and a proton each travel with equal speeds around circular orbits
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This note was uploaded on 04/01/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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Exam 2--Fall 2004 - 0h1prc,b2AA 4e&JL z06+ tloo\r\ Z on has...

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