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Module 4
We are all familiar with ferromagnetism or the magnetic behavior of substances such as iron, nickel, and cobalt. These materials align the magnetic moments of their own atoms with an externally imposed magnetic field. In other words materials exhibiting ferromagnetism become magnetic themselves when exposed to an external magnetic field. Less familiar are paramagnetic and diamagnetic materials. Paramagnetic materials may become magnetized but do not retain a magnetic field as say an iron nail might. Diamagnetic materials actually align their internal magnetic moments in opposition to an externally imposed magnetic field.Maxwell's equations are sufficient to describe the magnetic fields of refrigerator magnets, and even the intense fields required to levitate diamagnetic objects within high magnetic field laboratories. The situation becomes rapidly more complex when the materials and fields involved begin to self interact.It is thought that the Earth generates magnetic fields through a combination of convection of a molten core and the rotation of the planet. We have not successfully been able to simulate this process in part because the system is self- interacting, or non linear. This occurs because magnetic fields generated by currents in one portion of the Earth's interior begin to exert forces on and alter the motion of other convective currents elsewhere in the system.To complete this discussion activity:Do your own internet research, and then write an initial response to the following three discussion prompts. Post your response to the discussion board.
dynamo theory, inner core, outer core, convection, and rotation. The Earth's magnetic field undergoes periodic reversals. How was this discovered, and by whom? What is the current best theory of its cause? How does the magnetosphere interact with charged particles in the solar wind? What happens to a planet without a planetary magnetic field, e.g. Mars?
Our balance is maintained, at least in part, by the endolymph fluid in the inner ear. Spinning displaces this fluid, causing dizziness. What is the radial acceleration (in m/s2) of the endolymph fluid
an air capacitor is made from two flat parallel plates 1.50 mm apart. the magnitude of charge on each plate is 0.0180
a container is filled to a depth of 20.0 cm with water. on top of the water floats a 35.0 cm thick layer of oil with
1) A+4.51-nC charge is located 4.10 m from a-2.86-nC charge. Find the magnitude of the electrostatic force exerted by one charge on the other.2) An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge = +79e). What i..
A 2.50 cm high object is placed 3.5 cm in front of a concave mirror. If the image is 6.0 cm high and virtual, what is the focal length of the mirror
An electron is accelerated from rest by a potential dissimilarity of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field. Compute the speed of the electron.
The width of the ribbon normal to a radius vector originationg at the star's center is much greater than the thickness of the ribbon in the radial direction.
A converging lens and a diverging lens, separated by a distance of 30.0 cm, are used in combination. Calculate the focal length of the diverging lens
Light of wavelength 520 nm passes through a slit of width 0.230 mm. How far is the screen from the slit
An airplane propeller is rotating at 1900 rpm (rev/min). compute the propeller's angular velocity in rad/s
an irregularly shaped piece of metal has a weight of 0.882 n. it is suspended from a scale which reads 0.735 n when the
question1a small metal ball carrying a net charge of q1 -2.40 mu c is held in a stationary position by insulating
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