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**1. Homework Statement**

In a compact cicrcualr coil "A" (radius R= 25cm),formed by N=150 loops of wire, flows I=10A current.

There's another compact circular coil "B" over "A"(radius r= 1.5 cm, loops n= 30) coaxial with "A" distant X ,in which i= 4A flows .

in the same direction of "I" (look at the image).

Calculate the mutual force between the two coils, and is it repulsive or attractive ?

Calculate X value when the force is Maximum.

http://img179.imageshack.us/img179/7660/bobinacn6.jpg [Broken]

HELP ME I DON'T KNOW HOW TO SOLVE IT.....sorry for the translation English isn't my mother tongue. I already posted it in the advanced phys section but maybe this is the right section...

**2. Homework Equations**

..all about mutual induction, auto induction, coils, magnetic energy

**3. The Attempt at a Solution**

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