Three long parallel wires are 3.8 c m from one another. (Looking along them, the

Question

Three long parallel wires are 3.8 cm from one another. (Looking along them, they are at three corners of an equilateral triangle.) The current in each wire is 3.70A , but its direction in wire M is opposite to that in wires N and P(Figure 1) .

A. In figure 20-60, determine the magnitude and direction of the magnetic field at the midpoint of the side of the triangle between wire M and wire N.

Three long parallel wires are 3.8 cm from one another. (Looking along them, they are at three corners of an equilateral triangle.) The current in each wire is 3.70A , but its direction in wire M is opposite to that in wires N and P(Figure 1) . A. In figure 20-60, determine the magnitude and direction of the magnetic field at the midpoint of the side of the triangle between wire M and wire N.

Explanation / Answer

we have

Magnetic field B =

since the field from M and from N cancel each other out we're left with only the field from P which is

Distance r = sqrt ( 0.038^2 + 0.019^2) = 0.02248 m

m from our midpoint of MN. This would give us B =

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