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Q. What speed would a proton need to circle the Earth 800 km above the magnetic equator, where the Earth's magnetic field is directed on a line between magnetic north and south and has an intensity of 4 x10-8 T?

Q. A classroom slide projector projects an enlarged (55 times taller) image of a 24 mm high photographic film onto a screen located 10 meters from the projector. What focal length lens (cm) does the slide projector require to produce a sharply focus image at this distance?

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