As shown in the figure, a potentiometer wire of resistance 20 ohm and length 300 cm is connected wi

As shown in the figure, a potentiometer wire of resistance 20 ohm and length 300 cm is connected with resistance box ( R.B) and a standard cell of emf 4 V . For a resistance R of resistance box introduced into the circuit, the null point for a cell of 20 mV is found to be 60 cm .The value of R is .... ohm .
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