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Q.

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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a

8  Ω in series

b

18  Ω in series

c

8  Ω in parllel

d

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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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