122Aex3Win09verAsol - Name_Student ID Score last first 20...

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Name ___________________________________ Student ID ____________ Score _______ last first Physics 122A, Winter 09, Version A Exam 3, page 1 I. Spherical Capacitor Two thin concentric spherical conducting shells are used as a capacitor. The radii are 10 cm and 30 cm, respectively, and each sphere is originally uncharged. Electrons are removed from the inner sphere and transferred to the outer sphere until the net charge on the outer sphere is Q = 1 . 0 x 10 -6 C. After this, the spheres remain electrically isolated for questions 1-4 below. 1. (3 pts) Which choice best represents the charge distribution for the spheres? A. Positive on outer skin of inner sphere, negative on inner skin of outer sphere. B. Positive on outer skin of inner sphere, negative on outer skin of outer sphere. C. Positive on inner skin of inner sphere, negative on inner skin of outer sphere. D. Positive on inner skin of inner sphere, negative on outer skin of outer sphere. E. Positive inside volume of inner sphere, negative on inner skin of outer sphere. 2. (4 pts) Which choice best represents equipotential surfaces near these spheres? A B C D E 60 cm 20 cm
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Name ___________________________________ Student ID ____________ Score _______ last first Physics 122A, Winter 09, Version A Exam 3, page 2 60 cm 20 cm I. Spherical Capacitor, continued: Recall the charge on the outer sphere is Q = 1 . 0 x 10 -6 C. 3. (5 pts) Which choice best represents the magnitude of the potential difference between the spheres? 8 . 0 x 10 1 V 6 . 0 x 10 2 V 3 . 0 x 10 4 V 6 . 0 x 10 4 V 8 . 0 x 10 5 V A B C D E 4. (4 pts) Which choice best represents the work done to move all of these electrons from the inner sphere to the outer sphere?
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