Two cells of EMF 2E and E and internal resistance 2r and r respectively are connected in parallel. obtain the expression for equivalent EMF and the internal resistance of the combination

If cells are connected in parallel, 
a) Eeff:-

using the above given relation u can solve ur query... :) 

first let's find the equivalent internal resistance 
----> r= 2r/3

now for the equivalent emf
this implies E=r(E1/r1+E2/r2)
​therefore, on substituting the values

hope it helps.... :) 

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to find equivalent resistance
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You will find it easy

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