Question

Twenty cells each of emf E and internal resistance r are connected in series to form a loop.if polarity of one of the cell is reversed, then terminal potential across this cell is?

Answer 1

Answer:

Terminal voltage of cell which is connected with reverse polarity is 1.9 E

Explanation:

Total 20 cells are connected in a single loop

So here 19 cells are connected in same side while one cell is reversed

so we have net EMF of all cells

$E_{net} = 19E - E$

$E_{net} = 18 E$

total resistance of complete circuit

$R = 20 r$

so current in the loop is given as

$i = \frac{18E}{20r}$

$i = 0.9\frac{E}{r}$

now terminal voltage of the reverse connected cell is given as

$V = E + ir$

$V = E + 0.9 E$

$V = 1.9 E$

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Topic : Terminal voltage of cell

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