An electronics company makes communications devices for military contracts. The company just completed two contracts. The navy contract was for 2,200 devices and took 27 workers two weeks (40 hours per week) to complete. The army contract was for 5,454 devices that were produced by 35 workers in three weeks.
January 16, 2018
Sketch a budget constraint in a leisure-income diagram – a.k.a. a leisure-goods diagram – that is consistent with this proposal.
January 16, 2018

Consider a circular cylindrical solenoid of finite length L, radius a, with N turns of wire carrying current I0. The current may be approximated by a surface current density K⃗ = N I 0 / L φˆ .

Consider a circular cylindrical solenoid of finite length L, radius a, with N turns of wire carrying current I0. The current may be approximated by a surface current density K⃗ = N I 0 / L φˆ .

(a) Calculate the magnetic field on the axis of the cylinder halfway between the end. (Hint: Subdivide the solenoid into infinitesimal current rings dI = Kdz′ and perform an integral.)

(b) Calculate the magnetic field on the axis of the cylinder at either end. (c) Show that Bend/Bcenter approaches 1/2 as L/a → ∞.

 

 

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