In the circuit shown in figure. The cells E,F,G and H have e.m.f's 2,1,3 and 1 V and internal

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In the circuit shown in figure. The cells E,F,G and H have e.m.f's 2,1,3 and 1 V and internal resistance 2,1,3 and `1Omega` respectively. Find the potential differences between points B and D, and across the terminals of the cells G and H.
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