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 degree angle below horizontal. You make a 80 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 degrees below horizontal) as the earth's field but with a horizontal component that points south rather than north.

Part A
What is the proper orientation of the coil? Choose the best answer.
(a) Axis of the coil is horizontal and directed south-north.
(b) Axis of the coil is horizontal and directed east-west.
(c) Axis of the coil is 60 degrees below horizontal and directed south-north.
(d) Axis of the coil is 30 degrees above horizontal and directed south-north.


Part B
What is the necessary current?
Express your answer to two significant figures and include the appropriate units.
I = _________

Explanation / Answer

the orientation of the coil should be horizontal - south north the formula you need is: (Earth's magnetic field * diameter) / (number of turns of coil * permeability constant)

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