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  • When n identical cells are connected in parallel with emf of each cell is E and internal resistance is r then equivalent resistance of the cells areOption: 1</st

When n identical cells are connected in parallel with emf of each cell is E and internal resistance is r then equivalent resistance of the cells are

Option: 1

r


Option: 2

nr


Option: 3

\frac{r}{n}


Option: 4

n^2r


Answers (1)

best_answer

As we learnt

 

Equivalent internal resistance -

 

R_{eq}= \frac{r}{n}

-

 

 

I_1=I_2=...=I_n=\frac{I}{n}

since all the cells are identical.

Applying kirchoff law

E=r.\frac{I}{n}+RI

or I=\frac{E}{R+\frac{r}{n}}

\therefore r_{rq}=\frac{r}{n}

 

Posted by

Divya Prakash Singh

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