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I = 9A
1/R'= 1/2 +1/3
= 3 +2 /6
=5/6
R'= 6/5
Req = 1 +6/5
= 5 +6/5
= 11/5
= 2.2 ohm
V = I R
V = 9 x 2.2
V = 19.8 v
When we remove resistor 2
Then resistor 1 and 3 are parallel to each other than
1/R" = 1/1 +1/3
= 3 +1 /3
=4/3
R" = 3/4
R"=0.75 ohm
V = I R
19.8 = I x 0.75
I = 19.8/0.75
I = 198/75
I =2.645..
I = 3 A (approx)
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