Question

what is the equivalent resistance between point a n b​

Answer 1

Equivalent resistance in Parallel Combination:

==> 1/R = 1/R1 + 1/R2

Here, R1 = ( 10Ω + 20Ω) ==> R1 = 30 Ω

and,

R2 = 10Ω + 10Ω ==> R2 = 20 Ω

Now,

1/R = 1/20 + 1/30

☛ 1/R = 5/60

☛ 1/R = 1/12

R = 12 Ω

Now, Total Resistance from A to B is:

==> 10Ω + R

☛ 10Ω + 12Ω

☛ Total Resistance = 22 Ω