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The resistance of the meter bridge AB in given figure is 4 Ω . With a cell of emf ε = 0.5 V and rheostat resistance R h = 2 Ω the null point is obtained at some point J. When the cell is replaced by another one of emf ε = ε 2 the same null point J is found for R h = 6 Ω . The emf ε 2 is, : A J B 6V R h ε

1. 0.3 V
2. 0.6 V
3. 0.5 V
4. 0.4 V

Correct answer: 0.3 V

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