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Q.

The resistance R=VI where V=(100±5)volt and I=(10±0.2)amp . Find the percentage error in R

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a

5.2%

b

7%

c

4%

d

2.5%

answer is B.

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Detailed Solution

V=100±5 

I=10±0.2

R=VI

RR=VV+II

         = 5100+0.210

         = 5100+2100

         =  7100

RR×100=7%

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