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Q. The electrical force on a pair of charges is 60 N. If those same charges are moved such that the new force between them is 15 N, what is the new distance between the charges?

Q. A dentist uses a small mirror of radius 45 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 14 mm from the tooth, what is the magnification of the resulting image?

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