1.

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 Rh = 2 Ω. The null point is obtained at some point J. When the cell is replaced by another one of emf ϵ = ϵ2, the same null point J is found for Rh = 6 Ω. The emf ϵ2 is

A. 0.6 V
B. 0.3 V
C. 0.5 V
D. 0.4 V
Answer» C. 0.5 V


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