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Q.

Two resistance are measured in ohm and is given as:R1=3Ω±1%R2=6Ω±2%When they are connected in parallel, the percentage error in equivalent resistance is

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a

3%

b

4.5%

c

0.67%

d

1.33%

answer is D.

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Detailed Solution

1Req=1R1+1R2dReqR2=dR1R12+dR2R22⇒dReqReq=dR1R12+dR2R22×Req⇒13+26×2⇒∴% error =43%

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