A CO2 cartridge is used to propel a small rocket cart. Compressed gas, stored at 35 MPa and 20C, is expanded through a smoothly contoured converging nozzle with 0.5 mm….
show that the effective electrical resistance of a solenoid is given by (13.79).
A solenoid coil with N turns per unit length, a length of L, and a radius of r0 is used to image an object of radius r0 with uniform resistivity of ρ. The coil is excited with a current I(t) = cos(2πν0t).
(a) What is the average power dissipated in the object? What is the voltage induced for a cylindrical shell of radius r?
(b) Given that the differential conductance of a cylindrical shell with length L, radius r, and resistivity ρ is dG = Ldr/(2πrρ), show that the effective electrical resistance of a solenoid is given by (13.79).