An ammeter gives full deflection when a current of 2 A flows through it. The resistance of ammeter is 12 Ω. If the same ammeter is to be used for measuring a maximum current of 5 A, then the ammeter must be connected with a resistance of

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8 Ω in series

18 Ω in series

8 Ω in parllel

18 Ω in parallel

answer is C.

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Detailed Solution

iig=1+GS ⇒ 52 =1+12S ⇒ S=8 Ω In parallel

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