HOTS I — task. Science CBSE, Class 10.

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1. Five cells, each of emf E and internal resistance r are connected in series. If due to over sight, one cell is connected wrongly, then the equivalent emf and internal resistance of the combination is

$5E\ and\ 5r$
$3E\ and\ 3r$
$3E\ and\ 5r$
$5E\ and\ 3r$

2. A circuit whose resistance

$R$ is connected to

$n$ similar cells. If the current in the circuit is the same whether the cells are connected in series or in parallel, then the internal resistance r of each cell is given by

$r\ =\ \frac{R}{n}$
$r\ =\ R$
$r\ =\ nR$
$r\ =\ \frac{1}{R}$

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54. HOTS I

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