MAGENTIC FIELD



Physics 42 Lab 8

The Earth’s Magnetic Field

PARTS LIST

|Part |Quantity | |

|Plastic Rulers |1 | |

|BB Cables |3 | |

|Dip Angle |1 | |

|Power Supply |1 |[pic] |

|Ammeter |1 |[pic] |

|Tangent Galvanometer |1 |[pic] |

FIRST: Generate Data: Pre-lab.

If you did the prelab, transfer the values you found for the Earth’s magnetic field to this table. If you didn’t do the prelab, do it now: Find the Earth’s magnetic field from this NOAA magnetic field calculator. Use zip code (95404 ) first to generate the latitude and longitude. Use an elevation (.05 m) for SRJC. Record the values for th e B (given as F), BH (given as H, and its components X(+N) and Y(+E)) and BV (given as Z(+D). View your results in list format and enter the values in this table.

|D (deg) |I (deg) |H (nt) |X (nt) |

|0.5 | | | |

|0.75 | | | |

|1.0 | | | |

Average Be from measurement (nT) =

|Quantity |Measured Value |NOAA Value |% Difference |

|BH (nT) | | | |

|Declination | | | |

|(degree) | | | |

|Inclination | | | |

|(degree) | | | |

|Bv (nT) | | | |

|B (nT) | | | |

Show Calculations of Bv and B:

Part 2. The Earth’s Magnetic Field and Pole Reversal

Go to the website for the NOAA Geomagnetism and check it out:



Read the FAQ on the Earth’s magnetic field to answer the questions below.

a. What causes the Earth’s Magnetic Field?

b. What is the dynamo effect?

c. Where is the Magnetic North Pole now?

d. How fast is it moving? What direction is it moving in?

e. How do we know the poles are changing and that one day they may flip?

f. How do we know the poles flipped in the past?

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BH

Bi

(

BS

[pic]

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