MJ16 P13 Q37 Parallel Battery Internal Resistance | May/June 2016 | Cambridge A Level 9702 Physics

9702/13/M/J/16: Two identical batteries each have e.m.f. 6.0 V and internal resistance r. The batteries are connected to an external resistor of resistance 11 Ω, as shown. The current in the external resistor is 0.50 A. What is the internal resistance r of each battery?
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