A solenoid of radius r = 1.25 cm and length ℓ = 28.0 cm has 305 turns and carries 12.0 A. Figure (a) is an illustration

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A solenoid of radius r = 1.25 cm and
length ℓ = 28.0 cm has 305 turns
and carries 12.0 A.
Figure (a) is an illustration of a solenoid, which is a
horizontal cylinder with a wire wound around its length into a
coil. If viewed from the right end of the cylinder, the
current I flows clockwise through the coil. The
solenoid has length ℓ along the length of the cylinder. A
circle of radius R is drawn around the center of
the cylinder, where the plane of the circle is perpendicular to the
length of the cylinder. Radius R is larger than
the radius of the solenoid.
Figure (b) is a cross-sectional end view of the solenoid. A
tan-colored ring, the annulus, has inner
radius a and outer radius b. A
concentric wire circle surrounds the annulus, with
radius r > b.
(a) Calculate the flux through the surface of a disk-shaped area
of radius R = 5.00 cm that is positioned
perpendicular to and centered on the axis of the solenoid as in the
figure (a) above.
µWb

(b) Figure (b) above shows an enlarged end view of the same
solenoid. Calculate the flux through the tan area, which is an
annulus with an inner radius of a = 0.400
cm and outer radius of b = 0.800 cm.
µWb
A solenoid of radius r = 1.25 cm and length ? - 28.0 cm has 30 tums and carries 12.0 A. IR D (a) Calculate the flux through the surface of a disk-shaped area of radius R = 5.00 em that is positioned perpendicular to and centered on the a JWb (b) Figure (b) above shows an enlarged end view of the same solenoid. Calculate the flux through the tan area, which is an annulus with an inner wwb