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 at a 60 angle below horizontal. You make a 70cm diameter, 200-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 below horizontal) as the earth's field but with a horizontal component that points south rather than north.What is the necessary current?

Explanation / Answer

: I=(B*d)/(N*u0)

B=the magnetic field in Tesla
d=diameter in meters
N=number of turns
u0=permiability constant=4*(pi)* 10-7

I = ( 50 * 70 * 10-2 ) / (200 * 4*(pi)* 10-7 )

= 139260.5 A

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