   Chapter 19, Problem 43P

Chapter
Section
Textbook Problem

A lightning bolt may carry a current of 1.00 × 104 A for a short time. What is the resulting magnetic field 1.00 × 102 m from the bolt? Suppose the bolt extends far above and below the point of observation.

To determine
The resulting magnetic field from the bolt.

Explanation

Given info: The current in the lightning bolt is 1.00×104A . Magnetic field at 1.00×102m is required.

Explanation:

Since it is supposed that the bolt extends far above and below the point of observation, the bolt can be treated as a long straight conductor. The magnetic field due to the bolt will be,

B=μ0I2πr

• μ0 is the permeability of free space
• I is the current
• r is the distance of the point from the straight conductor

Substitute 4π×107TmA-1 for μ0 , 1.00×104A for I , 1

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