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/outII.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/twoInPosX.png

Explanation / Answer

(a)

Ampere's right hand rule:

hold the current carrying wire as the thumb showing the direction of the current flow in a stright conductor,, then the curl of the fingers represents the direction of the magnetic field.

figure at first row and third column is correct

(b)

figure at first row and third column is correct

(c)

figure at first column and third row is correct

(d)

figure at first row and fourth column is correct

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