A flat rectangular coil consisting of 100 turns measures 25 cmby 20 cm. It is placed in a 0.5 T uniform magnetic field, with the plane ofthe coil parallel to the field. In 0.25 s, it is rotated so that the plane of thecoil is perpendicular to the field. (a) What is the change in the magneticflux through the coil due to this rotation? (b) Find the magnitude ofthe average emf induced in the coil during this rotation.

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