# Calculate the force that each wire exerts on each other

1. Nov 6, 2007

### tasha_michelle

need help asap...by 2:30 :(

if 2 parallel conductors with the same length of .05m have their currents going in opposite directions, one conductor carries a current of 10A. C=D/3, D=24cm, I is adjusted so the magnetic field @ C=0.

a. find the value of the current I
b. value of magnetic field @ point A (find magnitude & direction)
c. calculate the force that each wire exerts on each other

Last edited by a moderator: May 8, 2015
2. Nov 6, 2007

### Astronuc

Staff Emeritus
What is the formula for the magnetic field strength as a function of current and geometry.

I take it that C = D/3 is measured from the wire with the 10 A current? Then the distance from C to the other wire is 2D/3.

Does this look familiar - http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html

Umm - where is A? One can use superposition of fields.

3. Nov 6, 2007

### tasha_michelle

A is at the midpoint of the first wire...
A
I <---------------------

--------------------->10A
C

4. Nov 6, 2007

### tasha_michelle

a is at the midpoint of the first wire, C is at the midpoint of the second wire...what is the equation?

5. Nov 6, 2007

### Astronuc

Staff Emeritus
OK - but write the equation for the magnetic field due to a current in a wire, and determine the field due to 10A at D/3. The using that field and 2D/3, solve for the current in the other wire.

Then knowing the currents, solve for the resultant field at A.

See this - http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html