00:01
In this question we have some given data, we will write over here that is vs which is 40 volt, r1 which is 18 ohm, r2 which is again 18 ohm, r3 which is 18 ohm, r4 which is 9 ohm, r5 which is 9 ohm, r6 which is 3 ohm and l, okay, we can take it as l which is 5 mega h, c which is 10 mu f, okay.
00:43
Given switch is at position a for a long time, so time constant we have to find out, okay, time constant we have to find out and we know that the time constant, okay, we know that the time constant which is equal to r multiplied by l, the circuit is at position, the circuit is at the position, position a is, okay, and this is what the thing and t tau or time that is equivalent is equals to r equivalent multiplied by l equivalent.
01:28
In the above circuit, we have in the question that is l equivalent is equals to l which is 5 mh and this is equal to 5 multiplied by 10 to the power minus 3 h, okay, but r equivalent we have to find out from the diagram, from the circuit itself, okay.
01:47
So, the r equivalent which is voltage sources which is from short circuit and current sources which is from open circuit, okay.
01:54
The equivalent circuit we have and after that we will find out the r equivalent.
02:01
As we observe the circuit, we can understand that r2 and r3 are in parallel, okay, so that resultant resistance would be r2 multiplied by r3 divided by r2 plus r3...