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For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. A 1.80m -diameter current loop with 190 turns of wire is set up so that the field at the center is exactly equal to the earth's field in magnitude but opposite in direction.(Assume that magnetic field strength at the surface of the earth is 5X10^-5 T) What is the current in the current loop?

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