# Thread: Remanent or Residual Induction?

1. Does anyone know the difference between residual and remanent induction (flux density) for magnetics?

2.

3. Hi BigRob! Welcome to the board.

Bd; Remanent induction: is any magnetic induction that remains in a magnetic material after removal an applied saturating magnetic field, Hs. Bd is the magnetic induction at any point on the demagnetization curve; measured in gauss

Br; Residual Induction: (or flux density), is the magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit; measured in gauss

http://www.magneton-usa.com/defs.htm

http://www.mceproducts.com/knowledge-base/glossary/

http://www.appliedengineering.com/linacs/Pmagdef.html

Residual Induction - Br: The magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit, measured in gauss. Also referred to as "flux density".

Remanence - Bd: The magnetic induction remaining in a magnetic circuit after the removal of an applied saturating magnetic field. If the circuit incorporates an air gap, the remanence will be less than the residual induction. Also referred to as "remanent induction".

Cyndi

4. Hmm!!!

This doesn't quite make sense!!!

What is confusing me is the classic way remanence is taught.

http://hyperphysics.phy-astr.gsu.edu...s/magperm.html

THe quote

"The amount of magnetization it retains at zero driving field is called its remanence. "

"Br; Residual Induction: (or flux density), is the magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit; measured in gauss".

Both are the same aren't they?

THerefore is there a difference between remanence and remanent induction?

5. AAAHHHHHHHHHHHHH!!!!

I have just found

http://www.ndt-ed.org/EducationResou...eresisLoop.htm

Which quotes

"Residual Magnetism or Residual Flux - the magnetic flux density that remains in a material when the magnetizing force is zero. Note that residual magnetism and retentivity are the same when the material has been magnetized to the saturation point. However, the level of residual magnetism may be lower than the retentivity value when the magnetizing force did not reach the saturation level."

The statement that Cyndi gave in her reply states

"Residual Induction - Br: The magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit, measured in gauss. Also referred to as "flux density". "

So residual induction is only apllicable after saturation which contradicts the preceeding statement.

So are residual magnetism and residual induction different things? (I surely think not). Retentivity? Surely that was thrown in to confuse matters still further.

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