Three infinite straight wires are fixed in place and aligned parallel to the z-a

Question

Three infinite straight wires are fixed in place and aligned parallel to the z-axis as shown. The wire at (x,y) = (-14.0 cm, 0) carries current I1 = 3.7 A in the negative z-direction. The wire at (x,y) = (14.0 cm, 0) carries current I2 = 1.0 A in the positive z-direction. The wire at (x,y) = (0, 24.2 cm) carries current I3 = 6.7 A in the positive z-direction.
1) What is Bx(0,0), the x-component of the magnetic field produced by these three wires at the origin?
T
Your submissions:
3.05785E-6
Computed value: 3.05785E-6 Submitted: Sunday, October 14 at 10:39 PM
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2) What is By(0,0), the y-component of the magnetic field produced by these three wires at the origin?
T
Your submissions:
3.05785E-6
Computed value: 3.05785E-6 Submitted: Sunday, October 14 at 10:40 PM
Feedback:
3) What is Fx(1), the x-component of the force exerted on a one meter length of the wire carrying current I1?
N
4) What is Fy(1), the y-component of the force exerted on a one meter length of the wire carrying current I1?
N

5) What is Fx(2), the x-component of the force exerted on a one meter length of the wire carrying current I2?
N

6) Another wire is now added, also aligned with the z-axis at (x,y) = (0, -24.2 cm) as shown. This wire carries current I4 A. Which of the following statements is true?
If I4 is directed along the positive z-axis, then it is possible to make the y-component of the magnetic field equal to zero at the origin.
If I4 is directed along the negative z-axis, then it is possible to make the y-component of the magnetic field equal to zero at the origin.
If I4 is directed along the positive z-axis, then it is possible to make the x-component of the magnetic field equal to zero at the origin.
If I4 is directed along the negative z-axis, then it is possible to make the x-component of the magnetic field equal to zero at the origin.



I am having trouble with this problem. Especially the first 2 even though i used the formula b=(uI)/(2pR)

Explanation / Answer

Here is a video link to the solution http://youtu.be/VokwmJeWTXY

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