Question

resistance of open circuit

Answer 1

"As for the infinity symbol, the point is to illustrate that the particular path is an open circuit and no current will flow (R = infinity). Infinite resistance is the same like saying the resistor isn't connected at all, since no current can flow though it V/infinity = 0."

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Answer 2

let the current flowing=I
but the potential difference will be 0 because it is an open circuit.....
R=V/I
R=0/I=infinity....