Surface of Conducting Shell - Introductory Physics - Solved Paper, Exams of Physics

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FROM = FAX NO. : Mar. @5 2083 87:54PM P1 Physics 8B Spring 2003 MIDTERM 1 Section 1 Useful data: k=8.99x 10° N-m/C? & = 8.85 x 10 CYN-m? e€=16x10°C electron mass = 9.1 x 107 kg Note: In some problems it is possible that you are given more information than needed to solve the problem. 1, (10 pts) A point charge is at the center of a conducting spherical shell of inner radius 1.0 m and outer radius 2.0 m. The electric field is 5.0 N/C outward at d distance r = 0.50 m from the charge at the center, and 3.0 N/C inward at a distance r = 2.5 m from the charge. Find (a) the charge at the center, and (b) the charge on the inner surface and on the outer surface of theconducting shell. 2, (15 pts) The uniformly charged sheet has a charge per unit area of +2.5 x 10” C/m’. Find the work needed to move a charge +2.0 uC from point P, to point P,. Thy ‘}aen 7P, 3. (15 pts) In the circuit, find the power of each battery, stating whether energy is being supplied or absorbed by it. 0 | PB 10,0 ip 2.0 med 2.0 tL Lom 1.0 4. (10 pts) The electron has a velocity of 5.0 m/s in the direction shown, The magnetic field has a magnitude of 2.0 T. Find the magnitude and direction of the acceleration of the electron.