As shown in the figure, a potentiometer wire of resistance 20 Ω and length 300 cm is connecte

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As shown in the figure, a potentiometer wire of resistance
20

Ω
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
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