4 Electric Field Due to a Semicircular Charged Rod A thin plastic rod is bent into a semicircle with radius R. The left half of the semicircle is uniformly charged with a positive charge +q, and the right half is uniformly charged with a negative charge -q. Find the direction and magnitude of the electric field at the center P of the semicircle. +++ P Y I Figure 1: Semicircular rod with charges +q and -q centered at the origin

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