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Q. A circular wire loop of radius 0.50 m lies in a plane perpendicular to a uniform magnetic field of magnitude 0.40 T. If in 0.10 s the wire is reshaped from a circle to a square, but remains in the plane, what is the magnitude of the average induced emf in the wire during this time?

Q. A 65.0kg person consumes a small order of french fries (250.0Cal) and wishes to "work off" the energy by climbing 9.144m stairway. How many vertical climbs are needed to use the energy?

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