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EMF and EMF Devices

When n numb...

Question

When $n$ number identical cell of emf $E$ and internal resistance, $r$ is connected in parallel, the net internal resistance of the system will be

r

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n r

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r / n

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n / r

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Solution

The correct option is B $r / n$
As resistances are connected in parallel, so,
Net internal resistance:
$\frac{1}{R} = \frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{1}{R_{3}} . . . . . .$

$\Rightarrow R = \frac{r}{n}$

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Similar questions

(E, r), (\frac{E}{n}, \frac{r}{n}), (\frac{E}{n^{2}}, \frac{r}{n^{2}}), (\frac{E}{n^{3}}, \frac{r}{n^{3}}), . . . .

\frac{n r}{n - 1}

\frac{X E^{2} R}{(N r + R)^{2}}

^{'} n^{'}

^{'} e^{'}

^{'} r^{'}

^{'} m^{'}

N = m n

^{'} R^{'}

^{'} I^{'}

^{'} R^{'}

I = \frac{N e}{m R + n r}

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