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A potentiometer wire of length 100 cm has a resistance of 102. It is connected in series with resistance (shown in figure) and a

A potentiometer wire of length 100 cm has a resistance of 102. It is connected in series with resistance (shown in figure) and a cell of emf 2V and negligible resistance. A source of emf 10 mV is balanced against a length of 40 cm of potentiometer wire. For this, if R1=(Nx100-m) ohms, find the value of (m-N) .(here m,N

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