Question

effective resistance across ab solve urgently

Answer 1

answer is option 1 ) 20

Answer 2

At the extreme right corner,the three 2ohm resistors are in series.

=> Rseries=2+2+2=6ohm.

Next,the two three ohm resistors are \\el to each other,

=>1/Rparallel=2*1/3=2/3

=>Rparallel=3/2=1.5ohm.

now,the two 2 ohm resistors are in series with this 1.5 resistor.

=>Rser=2+2+1.5=5.5ohm

Now, the 5.5 ohm is //el with the 3 ohm resistor and so on...........

I won't give you the complete solution, as that would deprive you of the ability to think