PHYS/GEOL 406 Homework
 RU Links   Radford University   Department of Physics   RU Planetarium   RUSMART pages (weather) Spring 2013 Classes & Info   PHYS 112   PHYS 307   PHYS/GEOL 406   My daily schedule   My C.V. Summer jobs/internships   NSF REU Program (list of REU sites) Other links   The Nucleus (resources for    physics/astronomy undergrads)   Pre-Health information   R.U.F.R.E.E.Z.I.N.G.    pics from the north pole trip    the picture from the trip   Simple 2-liter water rocket   American Institute of Physics Homework #10: Due Monday, april 22 by 5:00-pm. Reading: pages 429-430 Section 7.2.1 to 7.2.3 Guess what is helpful--this is. So is this. section 5.8.2 These are the 4 basic electrode configurations. Note that the dipole-dipole does not have to have all 4 electrodes co-linear. section 5.8.3 is all about the preparatory work for doing a field survey Homework: All magnetic fields are created by moving charges. (You must never forget this!) You have a long straight wire that is oriented east-west. This wire has a current of 14.0A running from east to west through it. The horizontal component of Earth's magnetic field at the location of the wire points north and has a magnitude of 24,500nT. At what distance from the wire is the magnetic field strength due to the current the same as the horizontal component of Earth's field? Does cancellation of Earth's horizontal field occur above or below the wire? Explain. Hint: I like pictures. You are on Earth at a magnetic co-latitude of 23.5°. Find the horizontal component of Earth's main dipole field, the vertical component of Earth's dipole field, the total intensity of Earth's dipole field. You are at a place on Earth where HE = 12,628 nT; i = 77° 9' (downward); and XE = 5,133 nT. Compute the four remaining magnetic elements (declination 'd', YE, ZE and JE) of this location from the data given. Note: You should be able to use this information to find your (very) approximate location on Earth using maps such as this one from the magnetics section of the NGDC. problem 7.1 Consider this magnetic profile taken in a north-south line over a spherical body that has been magnetized by Earth's field. (a) Calculate the approximate depth to the center of this object. (b) Is the location y=(-)10m the southern or northern end of this profile? Explain your reasoning. Hint: Perhaps a drawing of the magnetic field of this anomaly would be helpful here.    That's all for homework #10.