(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Two long straight wires are shown. Wire 1 has a current of 25A and lies 0.05 m away from point O. Wire 2 carries a current of 110 A and sits a distance of 0.25m away from point O as shown.

(i) What is the direction and magnitude of the magnetic field at point O due ONLY to WIRE 1.

(ii) What is the direction (measured as an angle from the x-axis) of the magnetic field at point O from wire 2?

(iii) What is the magnitude of the magnetic field at point O due ONLY to WIRE 2?

(iv) What is the magnitude of the total magnetic field?

2. Relevant equations

B = (4pix10^{-7})I/(2pi*r)

3. The attempt at a solution

(i) Using the equation for a long straight wire I get B = 1.0 x 10^{-4}I'm a little confused on the direction. I'm not sure how to compute this. Do I need to use the right hand rule or is there some way to find an exact angle?

(ii) As in (i) im confused on how to find this. I would guess 40 degrees.

(iii) Using the equation for a long straight wire i get B = 8.8 x 10^{-5}

(iv) Here i'm assuming I need to use the angle I found above to figure this out.

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# Homework Help: Magnetic Fields of Long Straight Wires

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