Cell A has emf 2 E ad internal resistance 4 r. Cell B has emf E and internal resistance r. The negative of A is connected to the positive of B and a load resistance of R is connected across the battery formed. If the terminal potential difference across A is zero, then R is equal toA. `3r`B. `2r`C. `r`D. `5r`

Cell A has emf 2 E ad internal resistance 4 r. Cell B has emf E and in

1.	Cell A has emf 2 E ad internal resistance 4 r. Cell B has emf E and internal resistance r. The negative of A is connected to the positive of B and a load resistance of R is connected across the battery formed. If the terminal potential difference across A is zero, then R is equal toA. `3r`B. `2r`C. `r`D. `5r`
Answer» Correct Answer - C `i=(E_(1)+E_(2))/(R+r_(1)+r_(2)),V_(1)=E_(1)-ir_(1)`

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