Bats are capable of navigating using the earth\'s field-a plus for an animal tha

Question

Bats are capable of navigating using the earth's field-a plus for an animal that may fly great distances from its roost at night. If, while sleeping during the day, bats are exposed to a field of a similar magnitude but different direction than the earth's field, they are more likely to lose their way during their next lengthy night flight. Suppose you are a researcher doing such an experiment in a location where the earth's field is 50muT at a 60 degree angle below horizontal. You make a 70 cm diameter, 100-turn coil around a roosting box; the sleeping bats are at the center of the coil. You wish to pass a current through the coil to produce a field that, when combined with the earth's field, creates a net field with the same strength and dip angle (60 degree below horizontal) as the earth's field but with a horizontal component that points south rather than north. Part B What is the necessary current? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

1: The axis of the coil should be a) horizontal and directed south-north. #2: I=(B*d)/(N*u0) B=the magnetic field in Tesla (not microTesla) d=diameter in meters (not cm) N=number of turns u0=permiability constant=4piE-7 Source(s): Just did it on mastering physics and got it all correct-a-mundo! :D

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