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Byju's Answer

Standard XII

Physics

Parallel Combination of Cells

n identical c...

Question

$n$ identical cells each of electromotive force $e$ and internal resistance $r$ are connected in series of this combination. The current through $V$ is:

\frac{2 e}{n}

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\frac{n e}{n R + r}

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\frac{e}{R + n r}

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\frac{n e}{R + r}

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Solution

The correct option is A $\frac{2 e}{n}$
$I = (\frac{n e - 2 e}{n r})$
$I = \frac{(n - 2) e}{n r}$
$V = e - I r$
$V = e - \frac{(n - 2) e}{n}$
$V = \frac{(n e - n e + 2 e)}{n}$
$V = \frac{2 e}{n}$
Hence,
option $(A)$ is correct answer.

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Q. Infinite number of cells having emfs and internal resistances

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When $n$ resistors, each of resistance $R$ , are connected in series, the equivalent resistance is ___. When $n$ resistors, each of resistance $R$ , are connected in parallel, their equivalent resistance is ___.

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n identical cells each of electromotive force e and internal resistance r are connected in series of this combination. The current through V is:

The correct option is A 2enI=(ne−2enr)I=(n−2)enrV=e−IrV=e−(n−2)enV=(ne−ne+2e)nV=2enHence,option (A)is correct answer.

$n$ identical cells each of electromotive force $e$ and internal resistance $r$ are connected in series of this combination. The current through $V$ is:

The correct option is A $\frac{2 e}{n}$
$I = (\frac{n e - 2 e}{n r})$
$I = \frac{(n - 2) e}{n r}$
$V = e - I r$
$V = e - \frac{(n - 2) e}{n}$
$V = \frac{(n e - n e + 2 e)}{n}$
$V = \frac{2 e}{n}$
Hence,
option $(A)$ is correct answer.