In the following figure, the reading of an ideal voltmeter V is zero. Then, the relation between R, `r_(1) " and " r_(2)` is A. `R=r_(2)-r_(1)`B. `R=r_(1)-r_(2)`C. `R=r_(1)+r_(2)`D. `R=(r_(1)r_(2))/(r_(1)+r_(2))`

In the following figure, the reading of an ideal voltmeter V is zero.

1.	In the following figure, the reading of an ideal voltmeter V is zero. Then, the relation between R, `r_(1) " and " r_(2)` is A. `R=r_(2)-r_(1)`B. `R=r_(1)-r_(2)`C. `R=r_(1)+r_(2)`D. `R=(r_(1)r_(2))/(r_(1)+r_(2))`
Answer» Correct Answer - B `l=(2E)/(r_(1)+r_(2)+R)` ` V_(1)=E-lr_(1)=0` `implies " " l=E//r_(1)` `E=(2Er_(1))/(r_(1)+r_(2)+R)` `r_(1)+r_(2)+R=2r_(1)` `implies " " R=r_(1)+r_(2)`

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In the following figure, the reading of an ideal voltmeter V is zero. Then, the relation between R, `r_(1) " and " r_(2)` is A. `R=r_(2)-r_(1)`B. `R=r_(1)-r_(2)`C. `R=r_(1)+r_(2)`D. `R=(r_(1)r_(2))/(r_(1)+r_(2))`

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