Why Is the Conversion Between CGS and SI Units in Electromagnetism Confusing?

[Alireza_M]

Dear friends,

As you know, in CGS units we have vacuum permeability as unity (1). so H=B and we use Oersted for H.
on the other hand, in SI, permeability is (4 x pi x 0.0000001) and we use Ampere per meter for H. unfortunately after trying for couple hours, I couldn't derive the algebra of converting these to each other. everywhere they simply say just multiply 1000/(4 x pi) to amper per meter. but why? and how to derive this conversion coefficient?

I know that cgs is cm gram second and si is meter kilogram second and i know how to convert these, but when amperes come into play and when the formulas are different in a coefficient, I just get confused.

I apologies in advance if this looks ridiculous.

 

[Mark44]

Thread moved to General Physics, where more people might see it.

 

[Dale]

everywhere they simply say just multiply 1000/(4 x pi) to amper per meter. but why? and how to derive this conversion coefficient?

You cannot derive it. It is just a definition. There is no deeper reason besides the fact that is how the SI units are defined.