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A long resistor between point A and B as...

A long resistor between point A and B as shown in figure-3.35 has reisistance of `300 Omega` and is tapped at one thrid points.
(a) What is equivalent resistance between A and B
(b) If the potential difference between A and B is 320V, what will be the potential difference between B and C.
(c) Will this change if the `40Omega` resistor is disconnected?

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