The following figures show wires carrying currents either into the page or out o

Question

The following figures show wires carrying currents either into the page or out of the page. For each, choose the direction of the total magnetic field at the origin (the wires are all the same distance from the origin and carry the same magnitude current, each wire is either on the line y = x or on the line y = –x).

(a) http://www.webassign.net/userimages/djc321@psu/outIV.png

(b) http://www.webassign.net/userimages/djc321@psu/inIV.png

(c) http://www.webassign.net/userimages/djc321@psu/twoEachOutNegY.png

(d) http://www.webassign.net/userimages/djc321@psu/twoOutPosY.png

Explanation / Answer

Using the right hand rule
1. B at origin is along the vector at 3 rd row, 3rd column
2. B at origin is along the vector at 1 st row, 3rd column
3. B at origin is along the vector at 3 rd row, 1st column
4. B at origin is along the vector at 4 th row, 4th column

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