SP212 Lab: Seven  Magnetic Force between two Wires
Version: March, 2015
LAB 7
SP212
‐
Two parallel wires carry the same current I in opposite directions.
The overlapping length of the wires is called L , and they are separated by a center ‐ to ‐ center distance d .
L
A.
Is the magnetic force between the wires attractive or repulsive?
Explain.
B.
Calculate the magnitude of the magnetic field due to one wire at the location of the other wire.
Show your work.
C.
Calculate the magnitude of the magnetic force between the wires.
Show work.
D.
If you plot the magnitude of the magnetic force as a function of the square of the current, what will be the magnitude of the slope?
What will be the intercept?
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SP212 Lab: Seven  Magnetic Force between two Wires
Version: March, 2015
E.
Parallel wires carry equal and opposite currents as shown. The currents are 9.0 A each. One of the wires has a length of 0.15 m and the other wire is very long. If the separation of the wires is 0.0015 m, the force on the 0.15
m long wire is closest to
A. 2.9x10
‐3 N up.
B. 2.9x10
‐3 N down.
C. 1.6x10
‐3 N down.
D. 1.6x10
‐3 N up.
E. 4.2x10
‐3 N up.
Show all work:
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