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Q. A dentist uses a small mirror of radius 44 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is the magnification of the image?

Q. A solenoid 10.0 cm in diameter and 76.0 cm long is made from copper wire of diameter 0.100 cm with very thin insulation. The wire is wound onto a cardboard tube in a single layer, with adjacent turns touching each other. To produce a field of magnitude 25.0 mT at the center of the solenoid, what power must be delivered to the solenoid?

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