The resistance of the meter bridge AB in given figure is 4 $\Omega $. With a cell of emf $\varepsilon $ = 0.5 V and rheostat resistance Rh = 2 $\Omega $ the null point is obtained at some point J. When the cell is replaced by another one of emf $\varepsilon $ = $\varepsilon $2 the same null point J is found for Rh = 6 $\Omega $. The emf $\varepsilon $2 is, :

Question

The resistance of the meter bridge AB in given figure is 4 $\Omega $. With a cell of emf $\varepsilon $ = 0.5 V and rheostat resistance R_h = 2 $\Omega $ the null point is obtained at some point J. When the cell is replaced by another one of emf $\varepsilon $ = $\varepsilon $₂ the same null point J is found for R_h = 6 $\Omega $. The emf $\varepsilon $₂ is, :

0.3 V

0.6 V

0.5 V

0.4 V

Solution

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