An ammeter reads up to 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A, the value of the required shunt is

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0.09 Ω

0.03 Ω

0.3 Ω

0.9 Ω

answer is A.

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Detailed Solution

iig =1+GS ⇒ 101 =1+0.81S⇒ S=0.09 Ω

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