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Find the value of R for which no current...

Find the value of `R` for which no current will flow through `5V` battery

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Let the junction located at the center of rectangular portion of circuit be at zero potentials of many other points can be shown in the figure.Now current can be written in every branch satisfying KCL.
So, `R=(5-(-5))/5=2Omega`

Reading of `A_1=0` & reading `A_2=5 A`
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