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Physics-

General

Easy

Question

Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangement is suggestively shown below. Each electroplaques has an emf of 0.15 V and internal resistance of 0.25 $capital omega$

The water surrounding the eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of 500 $capital omega$ , the current an eel can produce in water is about

1.5 A
3.0 A
15 A
30 A

The correct answer is: 1.5 A

Given problem is the case of mixed grouping of cells
So total current produced $i equals fraction numerator n E over denominator R plus fraction numerator n r over denominator m end fraction end fraction$
Here $m equals 100 comma n equals 5000 comma R equals 500 capital omega$
$E equals 0.15 V$ and $r equals 0.25 capital omega$
$i equals fraction numerator 5000 cross times 0.15 over denominator 500 plus fraction numerator 5000 cross times 0.25 over denominator 100 end fraction end fraction equals fraction numerator 750 over denominator 512.5 end fraction$ $almost equal to 1.5 A$

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