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Abhishekdas
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Homework Statement
Please refer to the diagram which i have attached for better understanding...
A solenoid of inductance L with resistance r is connected in parallel to a resistance R. A battery of emf E and of negligible resistance is connected across the parallel combination. At time t=0 switch is opened, calculate current through the solenoid after the switch is opened.
Homework Equations
The Attempt at a Solution
This i guess will not pose too much difficulty for people who have done this topic for sometime but i am pretty new to it...
Anyway as long as switch was closed the inductor played no role...(di/dt = 0)
So we just take into consideration the resistance of the inductor and the external resistance in parallel and get current through each of them in the simple manner...
Now i am not getting exactly what will happen after the switch is opened. After the switch is opened means immediately after right? So just after it is opened what will be the distribution of current in the upper part of the circuit(the lower part has zero current). I think we have to get an equation using Kirchoff'd Law and then integrate it and put t=0.
But i am not being able to frame this equation because i think the current in each just after opening the switch will be same as before then maybe the currrent through one decreases and the other increases then maybe they become uniform and decrease uniformly to become zero after a long time...This is what i think and i guess am totally wrong here...So please help me out and correct my thinking...Waiting for a reply soon...Thank you