Department of Physics
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the picture from the trip
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American Institute of Physics
Homework #10: Due Monday, april 22 by 5:00-pm.
- 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
That's all for homework #10.
- 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.