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 50 ?T mu{ m T} at a 60 ? ^circ angle below horizontal. You make a 80cm cm diameter, 250-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 ? ^circ below horizontal) as the earth's field but with a horizontal component that points south rather than north.

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

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