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also why is it sometimes used interchangeably?

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- Thread starter chanderjeet
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- #1

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also why is it sometimes used interchangeably?

- #2

tiny-tim

Science Advisor

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Magnetic flux, Φ, is a scalar, measured in webers (or volt-seconds), and is a total amount measured across a surface (ie, you don't have flux at a point).

Magnetic flux density,

The flux across a surface S is the integral of the magnetic flux density over that surface:

Φ = ∫∫_{S} **B**.d**S**

(and is zero for a closed surface)Magnetic flux density is what physicists more commonly call the

It is a density

(and they

Similarly, *electric* flux is a scalar, measured in volt-metres, and * electric* flux density (also a density *per area*), **E**, is a vector, measured in volts per metre (and is more commonly called the **electric field**).

- #3

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that really cleared things up...thank you.

- #4

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There is also H, magnetization, measured in amp-turns per meter (in MKS units).

Bob S

Bob S

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- #6

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Bmax = Vmax/ (2*pi*f * A * n)

Where Bmax is the max magnetic flux density, Vmax is the max voltage over a coil with n turns wound on a toroid core with area A. 2*pi*f is the rate of voltage change per time unit.

It looks like the magnetic flux density is reduced :

If we increase the number of turns. Why?

If we increase the area. Why?

If we increase the rate of change of voltage applied. Why?

It looks like the magnetic flux density is increased:

If the max VOLTAGE is increased. Why? Isnt it the current that causes the flux density to increase?

I would appreciate a thorough and intuitive explaination!

Mike Hansen

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