i tried to put all data in the image .
in the initial situation K was closed.in T = 0 ,K was opened.
give the differenciel equation of the courant.
The Attempt at a Solution
(R+r)*i + L (di)/(dt) = 0 .
my problem is that i don't know if we have to put (R+r)*i or only r*i in the differentiel equation of the courant .
thanks in advance for any help.
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