Magnetic Field Produced by Straight Currents Video Lessons

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Problem: Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by transmission lines. A typical high-voltage transmission line is 20 m off the ground and carries a current of 200 A. A. Estimate the magnetic field strength on the ground underneath such a line. B. What percentage of the earth’s magnetic field does this represent?

FREE Expert Solution

Magnetic field around a wire carrying current:

B=μ0i2πr

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Problem Details

Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by transmission lines. A typical high-voltage transmission line is 20 m off the ground and carries a current of 200 A. 

A. Estimate the magnetic field strength on the ground underneath such a line. 

B. What percentage of the earth’s magnetic field does this represent?

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