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Grade 10Electric Current

How do I solve this problem?
Ans : Option 1
Please help

Question image for How do I solve this problem? Ans : Option 1 Pleas
Profile image of Myra
6 Years agoGrade 10
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1 Answer

Profile image of Vikas TU
ApprovedApproved Tutor Answer6 Years ago
Dear student 
Let us assume that Req = x 
Just left first 1 ohm and because it is infinite series , x will come in parallel to 1 ohm 
We can write 
x = x/x+1  + 1 
Simplify this 
2x + 1 = x^2 +x 
x^2 – x -1 =0 
The roots of this equation is :
1+sqrt(5)  / 2 
A is correct