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equalent resistance please solve the following question

equalent resistance please solve the following question 
 
 

Question Image
Grade:10

1 Answers

shashi K Sharma
46 Points
6 years ago
Dar Ashwin
 
The case illustrated is a case of infinite series whose each repeating step is double the prior step. Let the Req=r (let) then the equivalent resistance after the first sep may me written as 2r. Redraw the cir cuit then we get that the vertical resistance R is in parallel with 2r. Thus the equivalent resistance between will be equal to 2R + (2rR)/(2r+R) = r (as asuumed earler that equivalent resistance between A & B is r).
This leads to a quadratic equation whose solution comes as (5 +root41)R/4

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