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Q. 9

Expert-verified
Found in: Page 830

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by electric transmission lines. A typical high-voltage transmission line is above the ground and carries a current at a potential of . a. What is the magnetic field strength on the ground directly under such a transmission line? b. What percentage is this of the earth’s magnetic field of ?

(a) The magnetic field strength is

(b) Percentage will be

See the step by step solution

Part (a) Step 1: Given information

We have given,

Height of transmission line =

Current ion transmission line =

we have to find the magnetic field at the ground due to transmission line.

Step 2: Simplify

The magnetic field strength due to long wire is

Part (b) Step 1: Given information

We have given,

Magnetic field of the earth =

we have to find the percentage of transmission magnetic strength to earth magnetic strength.

Step 2: Simply

The percentage will be