Math Is Fun Forum
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#1 2012-07-21 07:44:06
- reallylongnickname
- Member
- Registered: 2011-03-30
- Posts: 50
correct?
Here is a question example out of text. Is the area correct? (I wasn't able to fill in the formula because of latex errors).
"What is the inductance of a 2 cm long, 150 turn coil wrapped on an low carbon steel core that is 0.5 cm diameter? The permeability of low carbon steel is 2.5 x10-4 H/m (Wb/At-m)."
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#2 2012-07-21 08:55:03
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: correct?
Hi reallylongnickname;
Check your area calculation again.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2012-07-21 11:11:41
- reallylongnickname
- Member
- Registered: 2011-03-30
- Posts: 50
Re: correct?
Yes, this is what I mean... I kept coming up with a different answer than the text book. 19.6 * 10^-6
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#4 2012-07-21 15:42:33
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: correct?
Hi;
The textbook is roughly correct.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#5 2012-07-21 19:17:22
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,140
Re: correct?
hi reallylongnickname
Looks like you are not squaring the 0.0025.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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