I have been working through Camara's sample exams and came across a couple of questionable solutions.
The first was the use of permeability in the calculation of inductance of a solenoid
Here is the equation: L = uN^2A/l
u = permeability which = u0*ur where u0 = 1.2566*10^-6 and ur = relative permeability
They gave the relative permeability, ur as 2000 but for their solution they compute u as (1.2566*10^-6)*(1)
Why do they use 1 and not 2000?
In another question, it asks you to solve the angle of the SRCs to reach a certain % of the peak value of a half rectified sine wave.
I use the exact method in the solution but when solving the integral, the solution computes -cos(180) = 0 whereas I have -cos(180) = 1
which completely changes the answer.
Am I going crazy or is this an error?
The first was the use of permeability in the calculation of inductance of a solenoid
Here is the equation: L = uN^2A/l
u = permeability which = u0*ur where u0 = 1.2566*10^-6 and ur = relative permeability
They gave the relative permeability, ur as 2000 but for their solution they compute u as (1.2566*10^-6)*(1)
Why do they use 1 and not 2000?
In another question, it asks you to solve the angle of the SRCs to reach a certain % of the peak value of a half rectified sine wave.
I use the exact method in the solution but when solving the integral, the solution computes -cos(180) = 0 whereas I have -cos(180) = 1
which completely changes the answer.
Am I going crazy or is this an error?
