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Question

In a parallel combination of two milli-ammeters with full scale deflection 10 mA and 100 mA shows reading of 4 mA and 24 mA respectively. The ratio of their internal resistance will be

A
10 : 1
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B
1 : 10
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C
6 : 1
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D
1 : 6
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Solution

The correct option is A 10 : 1
As the ammeters are connected in parallel,
So voltage is same,

RA=VIFSDA=V10mA

RB=VIFSDB=V100mA

RARB=100mA10mA=101=10:1


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