College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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**Magnetic Field of a Transmission Line**

A transmission line strung 5 meters above the ground carries a current of 400 A. What is the magnetic field on the ground directly below the wire?

**Hint:**
Review **Section 12.2 Magnetic Field Due to a Thin Straight Wire**, where a formula for the magnetic field due to a current in a long, thin, straight wire is derived. Watch the units and powers of 10.

Magnetic field due to the transmission line is **3.2 mT** (milliteslas).

*For comparison, the geomagnetic field is around 0.05 mT (varies by latitude). Does the transmission line significantly affect the magnetic field in the area near it?*

(Note: There are no graphs or diagrams in this image.)
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Transcribed Image Text:**Magnetic Field of a Transmission Line** A transmission line strung 5 meters above the ground carries a current of 400 A. What is the magnetic field on the ground directly below the wire? **Hint:** Review **Section 12.2 Magnetic Field Due to a Thin Straight Wire**, where a formula for the magnetic field due to a current in a long, thin, straight wire is derived. Watch the units and powers of 10. Magnetic field due to the transmission line is **3.2 mT** (milliteslas). *For comparison, the geomagnetic field is around 0.05 mT (varies by latitude). Does the transmission line significantly affect the magnetic field in the area near it?* (Note: There are no graphs or diagrams in this image.)
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