7. A semicircular plastic wire of radius R has a uniform linear charge density 1. A point charge Q is placed at the cent
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7. A semicircular plastic wire of radius R has a uniform linear charge density 1. A point charge Q is placed at the cent
7. A semicircular plastic wire of radius R has a uniform linear charge density 1. A point charge Q is placed at the center of the semicircle. What force does it feel? Give the magnitude and direction.
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