Three long parallel wires are 3.8 cm from one another. (Looking along them, they

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 3.80 A , but its direction in wire M is opposite to that in wires N and P(Figure 1) .

Part A

Determine the magnitude and direction of the magnetic field at the midpoint of the side of the triangle between wire M and wire N.

Express your answer using two significant figures.

Part B

What is the angle in degrees below the horizontal direction?

Express your answer using two significant figures.

Explanation / Answer

Field agnitude only due to P ; others cancelled=(mu)*I/4pi*r = 4pi * 10^-7 *3.8/ 4pi * 3.8 *10^-4 =10^-3

Field direction is determined by dx*r.

Part B could not be understood, no figure

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