SP212/3321&5521
Chapter 29 - Worksheet #1
Question 1: Two very long wires, separated by 0.64 m, are perpendicular to the page. i1 carries
2.0 A out of the page, while i2 carries 7.0 A into the page. What is the magnetic field at point P
marked below? Give your answer as a vector.
y
0.32 m
P
0.64 m
×
i1 =2.0 A
i2 =7.0 A
x
Question 2: Two very long wires, separated by 0.60 m, are perpendicular to the page. i1 carries
2.0 A out of the page, while i2 carries 4.0 A into the page. What is the magnetic field at point P ,
which is halfway between the wires? Give your answer as a vector.
y
0.60 m
i1 =2.0 A
P
×
i2 =4.0 A
x
SP212/3321&5521
Chapter 29 - Worksheet #1
Question 3: A current of 3.0 A moves counter-clockwise around a loop as shown below. The circular
regions of the loop have radii of 0.45 m and 0.90 m; the 0.90 m radius subtends 90◦ of angle while
the 0.45 m radius subtends 270◦ degrees. What is the magnitude of the magnetic field at point P ,
the center of curvature for the two arcs?
i=3.0 A
0.90 m
P
0.45 m
Question 4: (HRW Checkpoint 29-1) The figure here shows three long, straight, parallel, equally
spaced wires with identical currents either into or out of the page. Rank the wires according to the
magnitude of the force on each due to the currents in the other two wires, greatest first.
Question 5: Two very long, straight wires run parallel to each other and separated by 0.25 m. The
wire on the left carries 3.5 A in the +y direction, while the wire on the right carries 1.8 A in the −y
direction. What is the force acting on a 0.85 m long section of the wire on the right? Give both the
magnitude and direction.
i2 =1.8 A
y
x
0.25 m
i1 =3.5 A