Does magnetic flux change if the area is extended past the B field?

AI Thread Summary
The discussion revolves around calculating the magnetic flux through a disk positioned at the center of a solenoid. The solenoid has specific dimensions and carries a current, allowing for the calculation of the magnetic field (B) using the formula B = (permeability constant) * n * I, where n is the number of turns per unit length. A key point raised is whether the magnetic flux remains the same for disks of different radii, specifically questioning if extending the radius beyond the solenoid's diameter affects the flux. It is noted that as long as the disk is close enough to the solenoid, the flux calculation remains valid. The consensus is that the flux can be considered the same for disks up to the solenoid's radius.
gsquare567
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Homework Statement


A solenoid 2.50 cm in diameter and 30.0 cm long has 300 turns and carries 12.0 A. Calculate the flux through the surface of a disk of radius 5.00 cm that is positioned perpendicular to and centered on the axis of the solenoid.


Homework Equations


B = (permeability constant) * n * I
n is the number of turns per unit length, and I is the current



The Attempt at a Solution


n = 300 turns / 0.3 m = 1000
B is now known, but wouldn't the flux be the same for a disk of radius 2.50 cm and radius 5.00 cm, calculated as B * A = B * 2*pi*r^2, because the solenoid only has a radius of 2.5 cm and any greater than that doesn't matter?

Thanks =)
 
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