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l4. netic eld. A circular wire loop 40 cm in diameter has resistance 100 0 and lies in a horizontal plane. A uniform magnetic field points vertically downward, and in 25 ms it increases. linearly from 5.0 mT to 55 mT. Find the magnetic flux through the loop at (a) the beginning and (b) the end of the 25-ms period. (c) What's the loop current during this time? (d) Which way does this current ow