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midterm2_practice

midterm2_practice - Physics 9C Spring 2010 Midterm 2—...

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Unformatted text preview: Physics 9C Spring 2010 Midterm 2— Chapters 25—28 (Practice Exam) Name ID# Note: Closed book and closed notes. Calculators are allowed. No credit will be given without all work being shown. The following formulas may be useful to you. L I =—— V=IR R= — J=- E: J dt pA A p 2 .; P=VI=12R=V— Rseries=Rl+R2+... i =i+~1—+... i=3e RC R Rpaml'l‘el Rl R2 R F=qiix§ F=Iex1§ f=fix§ R=fl qB » #0 97x? ~ #0 13x? #01 B=—— B=— B=——-—- B= n1 4:: r2 :1: 1‘2 21;? M0 _M01112L ”. "_ "_ ”_ F— 2” €53 dl were“, 933 dA—O Constants: 80: 8.85 ><10'12 (3le m2 yo = 4:: x10” r m/A l. (25 pts) Circle the correct answers (you don’t have to show your work). (1) (5 pts) A light bulb is operated at 110V and has a power consumption of 60 W. The filament resistance is closet to: (A) 50 Q (B) 101 o (C) 202 9 (D) 404 o (E) 808 $2 (2) (5 pts) What is the power dissipated in the 2-9 resistance in the circuit? (A) 2.67 W (B) 5.33 W (C) 3.56 W (D) 6.67 W (E) 8.0 W (3) (5 pts) Alpha particles (charge = +3.2 X 10'19 C, mass = 6.68 X 10'27 kg) are accelerated in a cyclotron to a final orbit radius of 0.60 m. The magnetic field in the cyclotron is 0.10 T. The period of circular motion of the alpha particles is closest to: (A) 1.3 Ms (B) 2.0 Ms (C) 2.6 us (D) 3.2 us (E) 3.9 [as (4) (5 pts) A solenoid is wound with 350 turns on a form 4 cm in diameter and 50 cm long. The windings carry a current I in the sense that is shown. The current produces a magnetic field, of magnitude 2.5 mT at ' the center of the solenoid. The current in the solenoid windings is closest to: (A) 2.1 A W50 cn:—-————-—> (B) 2.5 A (C) 2.8 A 43;“ (D) 3.2 A l ' I ) +1 (E) 3.6 A (5) (5 pts) A very long, hollow, thin-walled conducting cylindrical shell (like a pipe) of radius R carries a current along its length uniformly distributed throughout the thin shell. Which one of the graphs shown most accurately describes the magnitude B of the magnetic field produced by this current as a function of the distance r from the central axis? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 2. (15 pts) A battery has an internal resistance of 1.0 Q and its open-circuit terminal voltage is 3.0 V. When a cylindrical wire 2.0 mm in diameter and 200 m long is connected across the terminals of this battery, the current in the circuit is 0.5 A. What is the resistivity of the material from which the wire is made? 3. (20 pts) In the figure below, calculate IE, 12, 13, 14, e1, 52. 4. (20 pts) A proton (charge = +1.6 X 10'19 C, mass = 1.67 X 10'27 kg) is first accelerated from rest through a potential difference Vand then enters a uniform 1.0~T magnetic field oriented perpendicular to its path. In this field, the proton follows a circular are having a radius of curvature of 2.0 cm. What was the potential difference V? 5. (20 pts) As shown in the figure below, a coaxial cable consists of an inner cylindrical conductor of radius R; on the axis of an outer hollow cylindrical conductor of inner radius R2 and outer radius R3. The inner conductor carries current 31in one direction, and the outer conductor carries current 21 in the opposite direction. The current is uniformly distributed through the conductor. What are the direction and the magnitude of the magnetic field at distance r from the axis of the cabEe in the following two cases: (a) R2 < r < R3 (inside the outer hollow cylindrical conductor), and (b) r > R3 (outside the cable)? ...
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