The figure below shows a current carrying wire located at the origin; the wire c

Question

The figure below shows a current carrying wire located at the origin; the wire carries a current of I = 8.1 A. Points 1, 2, and 3, are all on a circle with radius 18.6 cm which is centered on the origin. (All directions below should be an angle measured counterclockwise from the +x axis to the direction the field points.) (a) What is the magnitude of the magnetic field generated by the wire at any point on the circle? I For parts (b) - (d), assume the wire carries a current directed out of the page. (b) What is the direction of the magnetic field generated by the wire at point 1? (c) What is the direction of the magnetic field generated by the wire at point 2? (d) What is the direction of the magnetic field generated by the wire at point 3? II For parts (e) - (g), assume the wire carries a current directed into the page. (e) What is the direction of the magnetic field generated by the wire at point 1? (f) What is the direction of the magnetic field generated by the wire at point 2? (g) What is the direction of the magnetic field generated by the wire at point 3?

Explanation / Answer

A.

B = uo I / [2 pi r]

Thus,

B = 8.71*10^-6 T [answer, part a]

*****************
By right hand rules:

b) 90 degrees

c) 180 degrees

d) 315 degrees

e) 270 degrees

f) 0 degrees

g) 135 degrees

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