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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A cardiac pacemaker can be affected by a static magnetic field as small as 1.7 mT. How close can a pacemaker wearer come to a long, straight wire carrying 20 A?

To determine
How close a pacemaker wearer come to a long, straight wire.

Explanation

Given info: The cardiac pacemaker can be affected by a static magnetic field of 1.7mT . The current on the long straight wire is 20A .

Explanation:

The magnetic field of a long wire carrying current is given by,

B=μ0I2πr

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

On re-arrangement,

r=μ0I2πB

Substitute 4π×107TmA-1 for μ0 , 1

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