• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Field Strength

Status
Not open for further replies.

codan

New Member
Hi,

I am trying to calculate the magnetic field strength of an air core coil.

I have found the Permeabillity of Air is 1.256 x 10^-6,

My question is, for the 10^-6 is this just .00000010

so the Permeabillity of Air is 1.256 x .00000010

I am not sure, is this correct.
 

dougy83

Well-Known Member
No.

10^-6 (or 10E-6) is 0.000001

you should know that 10^0 is 1, and for every negative exponent you shift the decimal point to the left 1 digit. The opposite is true for positive exponents.
 

dknguyen

Well-Known Member
Most Helpful Member
Didn't you ever learn about exponents? For negative exponents:

X^-Y = 1/(X^Y)

So:
10^-6 = 1/(10^6) = 1/1000,000
 
Last edited:

codan

New Member
Thanks for the replies.

No i haven't learnt about exponents as yet.
Another thing i am having trouble with is say i have.

1.0000000000000001e-11

I do not know what the e is or what number this actually is, how do i write this number without using the e or -11 as an example.

Thank You
 

dougy83

Well-Known Member
The 'e' stands for 'exponent' and may be directly substituted by 'x10^' (the 'x' is for multiplication, the '^' raises to a power)

So, 1.0000000000000001e-11 = 1.0000000000000001x10^-11
 

j.friend

New Member
That is more than a little confusing, why would they use 'e' to denote exponent when it is more widely recognised as the natural number e (which ≈ 2.718)?
 

jasonbe

New Member
Hi,

I am trying to calculate the magnetic field strength of an air core coil.

I have found the Permeabillity of Air is 1.256 x 10^-6,

My question is, for the 10^-6 is this just .00000010

so the Permeabillity of Air is 1.256 x .00000010

I am not sure, is this correct.
Just out of curiosity, are you using the same formula as that for a solenoid? Are you using relative permeability - which I think might be your figure, the Permeability of Air, divided by the permeability of free space, 4*pi * 10^-7 T*m/A? I like to use * instead of x because I don't always know when x is referring to a cross product. I just wanted to make sure that by writing T*m/A I meant units - not variables.
 
Last edited:
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top