1.

Two batteries of difference emf's and internal resistance are connected in parallel to one another.

Answer»

EQUIVALENT emf will be grater than either of the emf's
Equivalent emf will be smaller than either of the emf
Equivalent internal resistance will be grater than either of the two internal resistances
Equivalent internal resistance will be smaller than either of the two internal resistances.

Solution :The equivalent emf of this COMBINATION will be SOMEWHERE in between the emf.s of two cells, depending on the internal resistances of cells, Contribution to equivalent emf will be more from the cell having less internal resistance. Hence, option (a ) and (b) are incorrect
Equivalent internal resistance of this combination will be the same as equivalent resistance when the two resistances are connected in parallel. We know that in parallel combination of two resistances, EFFECTIVE resistance is less than the MINIMUM of two. Hence, only option (d) is correct.


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