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 100cm diameter, 150-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?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

here,magnetic filed produced by coil should be equal to 5*10^-5 T

and points 120 degrees with Bh

B = N*mue*I/(2*r)

I = B*2*r/(N*mue)

= 5*10^-5*2*0.5*/(150*4*pi*10^-7)

= 0.2654 A

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