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Physics 5C: Electricity, Magnetism, and Modern Physics Exam 2 SPRING 2026 University of California
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15

May 2026

2025/2026
(4 points) A solid metal sphere carries a net positive charge. What is the electric field inside the sphere? A. Zero B. Points radially inward C. Points radially outward D. Depends on the amount of charge Answer: Solution: A. In electrostatic equilibrium, the electric field inside a conductor is zero. All excess charge resides on the surface. Distractors: (B) and (C) assume a field exists inside; (D) thinks the answer depends on the charge magnitude.
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Physics 5C: Electricity, Magnetism, and Modern Physics SPRING 2026 University of California
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14

May 2026

2025/2026
The two source charges (−Q at y = 0 and +9Q at y = d) remain fixed in place for the rest of this problem. Use the expression for V (y) given on the first page of this problem, which gives the potential due to these two charges only. (10d) (3 points) Calculate V at y1 = 2d and y2 = 3d. Show your work below, then record your answers. Solution: V (2d) = − kQ 2d + 9kQ 2d − d = − kQ 2d + 9kQ d = + 17kQ 2d = +7.6 × 105 V V (3d) = − kQ 3d + 9kQ 3d − d = − kQ ...
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