Helmholtz coils are frequently used in experiments because they create a uniform magnetic field about their central axis. For example, they are traditionally used in the experiment for the measurement of the charge-to-mass ratio of the electron. Helmholtz coils are two coils separated by a distance equal to their radius and also carry equal currents in the same direction, as shown in the figure. Suppose the radius of the coils is R = 18.50 cm and each coil carries a current of I = 9.00 A and has N = 420.0 turns. The coils are in the yz plane where one coil's center is at x = 0 the other coil's center is at x = R. Using the Biot-Savart law, determine the expression for the resultant magnetic field B, along the line x joining their centers. Express the magnetic field in terms of the radius of the coils R, the number of turns N, the current I, x, and the permeability of free space, lo.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter22: Magnetic Forces And Magnetic Fields
Section: Chapter Questions
Problem 71P: Assume the region to the right of a certain plane contains a uniform magnetic field of magnitude...
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Helmholtz coils are frequently used in experiments because they create a uniform magnetic field about their central axis. For
example, they are traditionally used in the experiment for the measurement of the charge-to-mass ratio of the electron. Helmholtz
coils are two coils separated by a distance equal to their radius and also carry equal currents in the same direction, as shown in
the figure. Suppose the radius of the coils is R = 18.50 cm and each coil carries a current of I = 9.00 A and has
%3D
%3D
N = 420.0 turns. The coils are in the yz plane where one coil's center is at x = 0 the other coil's center is at x = R.
%3D
Using the Biot-Savart law, determine the expression for the resultant magnetic field By along the line x joining their centers.
Express the magnetic field in terms of the radius of the coils R, the number of turns N, the current I, x, and the permeability of
free space, lo.
H0-1.R.N
Bx =
%3D
(R²+x²)*
(R²+(x-R)²)
Ex= R
B
X.
Evaluate the magnetic field B, at x = 4.625 cm (R) and x = 13.88 cm (R).
1.829 ×10-2
18.3 X10-2
B, (4.625) =
T
B (13.88) =
Incorrect
Transcribed Image Text:Helmholtz coils are frequently used in experiments because they create a uniform magnetic field about their central axis. For example, they are traditionally used in the experiment for the measurement of the charge-to-mass ratio of the electron. Helmholtz coils are two coils separated by a distance equal to their radius and also carry equal currents in the same direction, as shown in the figure. Suppose the radius of the coils is R = 18.50 cm and each coil carries a current of I = 9.00 A and has %3D %3D N = 420.0 turns. The coils are in the yz plane where one coil's center is at x = 0 the other coil's center is at x = R. %3D Using the Biot-Savart law, determine the expression for the resultant magnetic field By along the line x joining their centers. Express the magnetic field in terms of the radius of the coils R, the number of turns N, the current I, x, and the permeability of free space, lo. H0-1.R.N Bx = %3D (R²+x²)* (R²+(x-R)²) Ex= R B X. Evaluate the magnetic field B, at x = 4.625 cm (R) and x = 13.88 cm (R). 1.829 ×10-2 18.3 X10-2 B, (4.625) = T B (13.88) = Incorrect
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