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Q.

The resistance R=VI where V=(200±5)V and I=(20±0.2)A, the percentage error in the 
measurement of R is :  

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a

3%

b

5.5%

c

3.5% 

d

7%

answer is A.

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Detailed Solution

R=V1

According to error analysis 

dRR=dVV+dII

dRR=5200+0.220

dRR=7200

% error dRR×100=7200×100=3.5%

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