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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?
A hydrogen molecule with an initial velocity of 1200m / s makes a collision with a molecule of oxygen at rest. The reason for the masses of molecules is mO / mH = 16. What are the speeds of the molecules after collision.
A charge of 80nC is uniformly distributed along the x axis from x = 0 to x = 2.0 m. Determine the magnitude of the electric field at a point on the x axis with x= 8.0m
find the lowest frequency that make constructive interference.
An object is placed 40 cm from a concave mirror of radius 20 cm. Trace the image, show and find the location and characterize the image fully
Your toaster has a power cord with a resistance of 0.022 connected in series with a 9.4-nichrome heating element. The potential dissimilarity between the terminals of the toaster is 120 V. How much power is dissipated in the power cord?
Motor oil, with a viscosirt of 0.250 Ns//m^2, is flowing through a tube that has a radius of 3.00 mm and is 1.00 mm long. What is the average speed of the oil
The side-view mirror of an automobile has a radius of curvature of 15.0 cm. The mirror produces a virtual image one-third the size of the object. How far is the object from the mirror?
A horizontal beam of electrons initially moving at 4.1 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates.
a current of 0.307 a through your chest can send your heart into fibrillation ruining the normal rhythm of heartbeat
It was a rainy day and the coefficient of friction was estimated to be 0.42. Use these data to determine the speed of the car while the driver slammed on (and locked) the brakes.
a 0.700-kg ball is on the end of a rope that is 0.50 m in length. the ball and rope are attached to a pole and the
A 0.25 meter long wrench is located around a bolt and a 14 Newton force is applied halfway along the wrench at an angle of 30o with respect to the wrench. Obtain the torque applied to the bolt from this force
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