Math Is Fun Forum

engrymbiff

Member

Registered: 2010-06-14

Posts: 30

Two parallel whires, separated by a distance D, ... find the force...

Two parallel whires, separated by a distance D (midpoint distance), are charged with a current density L (each whire has a radius R). If the whires have the potential +/- X Volts, what is the force per unit length between them?

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Two parallel whires, separated by a distance D, ... find the force...

Wow,we are doing this part of physics now,too!

First find the current I using the formula

where S is the area of the wire cross-section.

Next use the formula for Ampere's force:

where I is the current,d is the length of the conductor which is this case a unit length and B is the induction of the magnetic field.

B can be calculated through the formula

where I is again the current, r is the distance between the two conductors and m is a constant that equals

If you have any questions, feel free to post them.

I want to ask if a mod could texify my post.    Stefy                             

Hope I got your formulas correct, Bob

Last edited by anonimnystefy (2012-05-29 07:12:46)

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,143

Re: Two parallel whires, separated by a distance D, ... find the force...

hi Stefy,

texify

?? Now you are making up your own English.  Do you mean convert the formulas into Latex?

Bob

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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

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Two parallel whires, separated by a distance D, ... find the force...

No,that is one of bobbym's phrases,and yes,it does mean convert to LaTeX.

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Two parallel whires, separated by a distance D, ... find the force...

I never got to thank you for" texifying" the formulas.

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.