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Question

Five cells each of emf E and internal resistance r send the same amount of current through an external resistance R whether the cells are connected in parallel or in series. Then, the ratio (Rr) is

A
2
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B
12
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C
15
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D
1
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E
5
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Solution

The correct option is D 1
When 5 cell are joined in parallel as shown,
i=netemftotalresistance
i=5E5R+r .... (i)
When 5 cell are joined in series as shown,
i=5E5r+R .... (ii)
So, according to the questions
5E5R+r=5E5r+R
or 4R=4rRr=44
Rr=1
723511_671824_ans_f07fe6ff08024620a5101f92d33559ba.PNG

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