In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P = 4 $\Omega $ and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :

Question

${{33} \over 5}\,\Omega $

6 $\,\Omega $

7 $\,\Omega $

${{20} \over 3}\,\Omega $

Solution

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