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A battery with EMF = Vb and internal resistance r is attached to the circuit with resistors R and R and a switch.When the switch

A battery with EMF = Vb and internal resistance r is attached to the circuit with resistors R and R and a switch.When the switch is open the current from the battery is lo and when the switch is closed the current from the battery is Ic.What is the EMF?I just need to know how to set this problem up. Thanks!

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