10. A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of themagnetic field 1.5 mm from the axis of the wire? Ans: 5.3 mTPHY201 -Review Problems 2017Page 4

13.
Two long straight wires carry currents perpendicular to the
xy
plane. One carries a current of 50 A
and passes through the point
x
= 5.0 cm on the
x
axis. The second wire has a current of 80 A and passes
through the point
y
= 4.0 cm on the
y
axis. What is the
magnitude
of the resulting magnetic field at the
origin?
Ans: 450µT
PHY201 -Review Problems 2017
Page 5

15
. A long, straight wire carries a current I. A right-angle bend is made in the middle of the wire. The
bend forms an arc of a circle of radius r as shown in Figure P30.1 Determine the magnetic field at point
P, the center of the arc.
Ans: 0.28415 µo I/r
PHY201 -Review Problems 2017
Page 6

16.
The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m
sides. All four wires are
much longer (long wires)
than the sides of the square. The net magnetic field
at the center
of the square is 61 μT.
Calculate
the current
I
.
17.
Two long, straight wires are separated by 0.120 m. The wires carry currents of 8.0 A in opposite
directions, as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled
(a)
A
and
(b)
B
.

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