Exam 2--Fall 2004

# 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 & \ - 1 1 | O I s , E S x l o ' l t * / ^ \ E \ = 5 q - Y ' > ' e . = ; " \-nL, 6T.' Z. Two wires made of different materials have the same uniform current density. They carry the same current onlY if: A. the potential differences across them are the same. B. the electric fields in them are the same. C. their lengths are the same. - 1 - 1 J v ..e\ (9) tner cross-sectional areas are the same. E. both their lengths andcross-sectional areas are the same. 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 l O - Ir- l , l - { ; . , - a L , = o ' - l l , ; * 1 i ^ * o l o v L w ' ' L A \ \L1 ,, VZ -, r ' - ? l n G d vl/ 7' 1 Z 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 andv*: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 witha battery as shown. Capacitor C1 hasvoltage V. The battery emf is A. 3V B. 2V D . V E. Vtz 6. The current density is the same in two wires, A and B. Wire A has halfthe free electron concentration of wire B. The drift speed of the electrons in A is: A. the same as thatof electrons in B. B. one-fourth that of electrons in B C. half thatof electrons in B. D. four times that of electrons in B. E, twiCe th;ff .l".tr"*--ilH} C r c z rTF*\ L l " ' ] t L T - 1 u F - u B / . \ . ) t V{v# ntuoto tt,/ t-"a; Y-vi.v Vlo,= zudb
t'q {2. Inthe circuit shown in the diagram, the four light bulbs all have the same resistance.

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• Fall '08
• DaveWinn
• Electron, Charge, electrons B., free electron concentration, instantan electron movingin, larger fne electron, halfthatof electrons B.

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