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Combination of Cells...

Combination of Cells

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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves (a) cells (b) potential gradients (c) a condition of no current flow through the galvanometer (d) a combination of cells, galvanometer and resistance

Two cells of emfs E_(1) and E_(2) are connected together in two ways shown here. The 'balance points' in a given potentiometer experiment for these two combinations of cells are found to be at 351.0 cm and 70.2 cm respectively. Calculate the ratio of the emfs of the two cells.

In parallel combination of n cells, we obtain

In the series combination of n cells each cell having emf epsilon and internal resistance r. If three cells are wrongly connected, then total emf and internal resistance of this combination will be

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