00:01
Given circuit diagram in the cushion and we are going to find the equivalent resistance between a and b value of r is given as 4 om so if you look at the circuit then by using symmetry we can say that no current will flow through this register and through this register so equivalent equivalent circuit can be redrawn as this resistance is r this resistance is r this is also r here we have a resistance r is connected r, r, r, this is r, this is r, this is r, this is r, again this is r, all the registers having resistance are r, r, r, this point is a and this point is b.
00:45
We have removed these two branches because there will be no current flow these two branches.
00:50
Now i can say that this are, this are, this are and this are all these four registers are in series, so their equivalent will be 4r.
01:00
And this r and this are both are in series equivalent will be 2 r this are and this are both are in series so equivalent will be 2 r so further equivalent circuit can be redrawn as this resistance is 4 r this is 4 r this is 2 r both are connected in parallel now a resistance r is connected here a resistance are is connected over here and here we have a 2 r resistance this point is a and this point is b now this 4 r and this 2 are both are in parallel so further equivalent resistance can be this 4 r and 2 are both are in parallel so their equivalent resistance will be 4 by 3 r so this is in here we have a resistance r a resistance r and here we have a resistance 2 r this point is a this point is b now this 4 by 3 r, this r, this r and this 4 by 3 r, they all are in series...