3/9/08 11:43 PM
MasteringPhysics
Page 1 of 9
http://session.masteringphysics.com/myct
Assignment Display Mode:
View Printable Answers
Physics 202
Assignment 7
Due at 11:00pm on Tuesday, March 11, 2008
View Grading Details
Problem 28.12
Description:
Two straight parallel wires are separated by d. There is a I current flowing in the first wire. (a) If the magnetic
field strength is found to be zero between the two wires at a distance of r from the first wire, what is the magnitude of the
current...
Two straight parallel wires are separated by 6.5
. There is a 2.7
current flowing in the first wire.
Part A
If the magnetic field strength is found to be zero between the two wires at a distance of 2.5
from the first wire, what is the
magnitude of the current in the second wire?
Express your answer using two significant figures.
ANSWER:
=
Part B
What is the direction of the current in the second wire?
ANSWER:
currents flow opposite to each other
currents flow at the same direction
Problem 28.14
Description:
A long pair of insulated wires serves to conduct I of dc current to and from an instrument. (a) If the wires are of
negligible diameter but are 2.8 mm apart, what is the magnetic field 10.0 cm from their midpoint, in their plane (see the
figure)? (b)...
A long pair of insulated wires serves to conduct 55.0
of dc current to and from an instrument.
Part A
If the wires are of negligible diameter but are 2.8
apart, what is the magnetic field 10.0
from their midpoint, in their
plane (see the figure)?
Express your answer using two significant figures.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
3/9/08 11:43 PM
MasteringPhysics
Page 2 of 9
http://session.masteringphysics.com/myct
ANSWER:
=
Part B
Compare to the magnetic field of the Earth (
).
Express your answer using two significant figures.
ANSWER:
=
Problem 28.21
Description:
Two long wires are oriented so that they are perpendicular to each other. At their closest, they are 20.0 cm apart
(see the figure). (a) What is the magnitude of the magnetic field at a point midway between them if the top one carries a current
of...
Two long wires are oriented so that they are perpendicular to each other. At their closest, they are 20.0
apart (see the figure
).
Part A
What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 20.0
and the
bottom one carries 12.0
?
ANSWER:
=
Magnetic Field from Two Wires
Description:
Calculate, at several different locations, the net magnetic field due to two straight infinite wires carrying anti
parallel currents. Students are asked to look for a pattern in the results as the points of interest become more and more remote
from the wires.
Learning Goal:
To understand how to use the principle of superposition in conjunction with the BiotSavart (or Ampere's)
law.
From the BiotSavart law, it can be calculated that the magnitude of the magnetic field due to a long straight wire is given by
,
where
(
) is the permeability constant,
is the current in the wire, and
is the distance from the wire
to the location at which the magnitude of the magnetic field is being calculated.
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 Everett
 Physics, Magnetic Field, 0%, 20.0 cm, 10.0 cm, Ampere, 2.8 mm

Click to edit the document details