2. Most people need a compass to navigate using magnetic fields, but birds, whales, deer, and many other organisms have the ability to detect Earth's magnetic fields without a compass. The mechanism that many organisms use to detect the magnetic field is still not entirely understood. However, the mechanisms of a group of bacteria that align with the magnetic field of Earth are well understood. The bacteria provide scientists with a simple organism that they can study to find out how organisms can naturally detect magnetic fields. What would be a reasonable hypothesis about how these bacteria detect the magnetic field? A. The bacteria respond to electric fields. B. The bacteria have iron particles in their bodies. C. The bacteria can see magnetic fields. D. The bacteria can detect gravity.

2. Most people need a compass to navigate using magnetic fields, but birds, whales, deer, and many other organisms have the ability to detect Earth's magnetic fields without a compass. The mechanism that many organisms use to detect the magnetic field is still not entirely understood. However, the mechanisms of a group of bacteria that align with the magnetic field of Earth are well understood. The bacteria provide scientists with a simple organism that they can study to find out how organisms can naturally detect magnetic fields. What would be a reasonable hypothesis about how these bacteria detect the magnetic field? A. The bacteria respond to electric fields. B. The bacteria have iron particles in their bodies. C. The bacteria can see magnetic fields. D. The bacteria can detect gravity.

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter29: Sources Of The Magnetic Field

Section: Chapter Questions

Problem 32AP: Why is the following situation impossible? The magnitude of the Earths magnetic field at either pole...

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Similar questions

If a cosmic ray proton approaches the Earth from outer space along a line toward the center of the Earth that lies in the plane of the equator, in what direction will it be deflected by the Earth’s magnetic field? What about an electron? A neutron?
Is the Earth's magnetic field parallel to the ground at all locations? If not, where is it parallel to the surface? Is its strength the same at all locations? If not, where is it greatest?
A 25-cm nod moves at 5.0 m/s in a plane perpendicular to a magnetic field of strength 0.25 T. The rod, velocity vector, and magnetic field vector are mutually perpendicular, as indicated in tire accompanying figure. Calculate (a) the magnetic force on an electron in tire rod, (b) the electric field in the rod, and (c) the potential difference between the ends of the rod. (d) What is the speed of the rod if the potential difference is 1.0 V?
Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept This technique is capable of detecting magnetic fields as weak as 1.0 1015 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.0 cm from the neuron.
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A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field? There may be more than one correct statement. (a) It exerts a force on the particle parallel to the field. (b) It exerts a force on the particle along the direction of its motion. (c) It increases the kinetic energy of the particle. (d) It exerts a force that is perpendicular to the direction of motion. (e) It does not change the magnitude of the momentum of the particle.
A cosmic ray electron moves at 7.50106m/s perpendicular to the Earth's magnetic field at an altitude where field strength is 1.00105T. What is the radius of the circular pain the electron follows?
Noting that the magnetic field lines of a bar magnet resemble the electric field lines of a pair of equal and opposite charges, do you expect the magnetic field to rapidly decrease in strength with distance from the magnet? Is this consistent with your experience with magnets?
Explain why the magnetic field would not be unique (that is, not have a single value) at a point in space where magnetic field lines might cross. (Consider the direction of the field at such a point.)
Why is the following situation impossible? The magnitude of the Earths magnetic field at either pole is approximately 7.0 105 T. Suppose the field fades away to zero before its next reversal. Several scientists propose plans for artificially generating a replacement magnetic field to assist with devices that depend on the presence of the field. The plan that is selected is to lay a copper wire around the equator and supply it with a current that would generate a magnetic field of magnitude 7.00 105 T at the poles. (Ignore magnetization of any materials inside the Earth.) The plan is implemented and is highly successful.
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