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Two cells E1 and E2 of EMF’s 5V and 9V and internal resistances of 0.3Ω and 1.2Ω respectively,

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Two cells E1 and E2 of EMF’s 5V and 9V and internal resistances of 0.3Ω and 1.2Ω respectively are connected to a network of resistances as shown in the figure. Calculate the value of current flowing through the 3Ω resistance.

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Net emf of circuit E = E2 - E1 = 9 -5 = 4V 

Net resistance of circuit,

Potential difference across parallel combination of 3Ω and 6Ω

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