Question: A single-turn circular loop of radius 8.5 cm is to produce a field at its center that will just cancel the earth's field of magnitude

A single-turn circular loop of radius 8.5 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7 G directed at 70o below the horizontal north direction. Find the current in the loop and make a sketch showing the orientation of the loop and the current.

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