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# At the equator, the earthâ€™s field is essentially horizontal;near the north pole, it is nearly vertical. In between, the anglevaries. As you move farther nort...

## Question

###### At the equator, the earthâ€™s field is essentially horizontal;near the north pole, it is nearly vertical. In between, the anglevaries. As you move farther north, the dip angle, the angle of theearthâ€™s field below horizontal, steadily increases. Green turtlesseem to use this dip angle to determine their latitude. Suppose youare a researcher wanting to test this idea. You have gathered greenturtle hatchlings from a beach where the magnetic field strength is50 Î¼T and the dip angle is 56âˆ˜. You

At the equator, the earthâ€™s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earthâ€™s field below horizontal, steadily increases. Green turtles seem to use this dip angle to determine their latitude. Suppose you are a researcher wanting to test this idea. You have gathered green turtle hatchlings from a beach where the magnetic field strength is 50 Î¼T and the dip angle is 56âˆ˜. You then put the turtles in a 1.1 m diameter circular tank and monitor the direction in which they swim as you vary the magnetic field in the tank. You change the field by passing a current through a 150-turn horizontal coil wrapped around the tank. This creates a field that adds to that of the earth. What current should you pass through the coil, to produce a net field in the center of the tank that has a dip angle of 62âˆ˜ ? Express your answer with the appropriate units.

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