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Q.

6 cells each of emf 1.5 V and internal resistance 1 $Ω$ are connected in series. One of the cell is joined with reverse polarity and whose combination is connected across a load resistance. The effective emf and internal resistance (across load resistance) are

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a

$6 V, 6 Ω$

b

$9 V, 6 Ω$

c

$6 V, 4 Ω$

d

$6 V, 4.5 Ω$

answer is B.

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Detailed Solution

$E_{eff} = (n - 2 m) E = (6 - 2 \times 1) E = 4 E$ $= 4 \times 1.5 = 6 V$
$Reff = r_{1} + r_{2} \dots r_{6} = 6 Ω$

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