SP212/3321&5521
Chapter 29 - Worksheet #2
Question 1: Two wires are shown below, carrying 3.0 A into the page and 5.0 A out of the page.
H
~ · d~s around the clockwise Amperean loop shown below?
What is the value of the integral B
×
3.0 A
5.0 A
Question 2: A long straight wire has a radius of 1.60 mm and carries a current of 15.0 A. The current
is evenly distributed with a constant current density. What is the magnitude of the magnetic field
(a) 0.80 mm from the center of the wire? (b) 1.60 mm from the center of the wire? and (c) 3.20 mm
from the center of the wire?
(b)
(c)
(a)
1.60 mm
SP212/3321&5521
Chapter 29 - Worksheet #2
Question 3: A long, straight, hollow cylinder has an inner radius if 1.20 mm and an outer radius of
2.40 mm. This hollow wire carries a current of 12.0 A spread evenly over the area between the two
radii. What is the magnitude of the magnetic field at point P , which is located 1.80 mm from the
center of the cylinder?
1.20 mm
P
2.40 mm
Question 4: (Homework Question 29-6) Four long, straight, cylindrical wires are labelled a, b, c, and
d. The graph below shows the magnitude of the magnetic field as a function of the radial distance
from the center of the wire. (a) Rank the four wires according to the total current being carries by
the wire. (b) Rank the four wires according to the current density (J) inside the wire.