Hello !

I want to calculate the magnetic field of a solenoid using B = u * N/L * I ; u - magnetic permeability, N - solenoid turns, L - Solenoid length, I - current
The current comes from a capacitor so I want to calculate the initial magnetic field strength but how to get I - current, can be used I = V/R ? so I have 200Volts and 2ohms I = 100Ampere.

 

You can calculate the inductance of the solenoid, then I = ∫V/L dt
(and it will get to 100A if you leave it switched on long enough, provided that your source can supply that much.

 

provided that your source can supply that much.

I have my doubts he will get it from his "charged capacitor".

The current comes from a capacitor