일반물리학 2 · Electric Fields · Problem 61
일반물리학 2 — Electric Fields: Problem 61
61 Figure 22-51a shows a nonconducting rod with a uniformly distributed charge $+Q$. The rod forms a half-circle with radius $R$ and produces an electric field of magnitude $E_{arc}$ at its center of curvature $P$. If the arc is collapsed to a point at distance $R$ from $P$ (Fig. 22-51b), by what factor is the magnitude of the electric field at $P$ multiplied?
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