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$\bullet$ Currents in the heart. The body contains many small currents caused by the motion of ions in the organs and cells. Measurements of the magnetic field around the chest due to currents in the heart give values of about 1.0 $\mu$ . Although the actual currents are rather complicated, we can gain a rough understanding of their magnitude if we model them as a long, straight wire. If the surface of the chest is 5.0 $\mathrm{cm}$ from this current, how large is the current in the heart?

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Physics 101 Mechanics

Physics 102 Electricity and Magnetism

Chapter 20

Magnetic Field and Magnetic Force

Motion Along a Straight Line

Motion in 2d or 3d

Electric Charge and Electric Field

Gauss's Law

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic field

Electromagnetic Induction

Inductance

University of Washington

Simon Fraser University

University of Winnipeg

Lectures

18:38

In physics, electric flux is a measure of the quantity of electric charge passing through a surface. It is used in the study of electromagnetic radiation. The SI unit of electric flux is the weber (symbol: Wb). The electric flux through a surface is calculated by dividing the electric charge passing through the surface by the area of the surface, and multiplying by the permittivity of free space (the permittivity of vacuum is used in the case of a vacuum). The electric flux through a closed surface is zero, by Gauss's law.

04:28

A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term is used for two distinct but closely related fields denoted by the symbols B and H. The term "magnetic field" is often used to refer to the B field. In a vacuum, B and H are the same, whereas in a material medium, B is a component of H. In the latter case, H is the "magnetic field strength", and B is the "magnetic flux".

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BIO Currents in the Heart.…

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The body contains many sma…

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02:31

We have seen that the hear…

01:52

BIO Currents in the Brain.…

01:09

Currents in the brain. The…

02:32

00:45

Calculate the Hall voltage…

for the given problem, it is given that the magnetic field around the just due to the currents in the hurt use the value off about 10 micro G. We need to find the current in the hurt caused by the motion off the eyes in the organs and the cells where the surface off the chest is our is equal to five centimeter. From this current, we will treat the current Is there very long wire the magnetic field of the distance off our from a very long while Getting a current I is given by B is equal to you know I divided by two by our from here. Then we console for eye. So I will be two pi r times it being divided by you know, next step we substitute the values we see that one g is a cold tent about minus four. When ji means one gauze, he's 10 to the power minus for Tesla. So we substitute the values for R and B. You know, we get the eye to be 2.5 times 10 to the power minus four in Pierre

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