The figure below shows a current carrying wire located at the origin; the wire c
ID: 1556078 • Letter: T
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 12.2 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? (T)
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]
4pi*10^-7(8.1)/(2pi*0.122)
B = 13.2*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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