2. Bats are capable of navigating using the earth\'s field-a plus for an animal
ID: 1731523 • Letter: 2
Question
2. 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 50 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 ? below horizontal) as the earth's field but with a horizontal component that points south rather than north. What is the necessary current? 3. The magnetic field at the center of a 1.5-cm-diameter loop is 2.9 mT . A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.9 mT ? 4. Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV; the beam was then steered to different points on the screen by coils of wire that produced a magnetic field of up to 0.53 T . What acceleration do they experience due to the magnetic field, assuming that it is perpendicular to their path? What is this acceleration in units of g?
Explanation / Answer
2) I=(B*d)/(N*u0)
B=the magnetic field in Tesla = 50E-6
d=diameter in meters = 0.5
N=number of turns = 100
u0=permiability constant=4piE-7
Plugging in, we get:
I = 0.1989 A
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