a galvanometer of resistance G ohm gives full scale deflection on passing a current I ampere. how will you convert it into an ammeter of range nl ampere.
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Explanation:
Ammeter has resistance G ohm and let S ohm be required shunt resistance connected in parallel to convert it into an ammeter of range nI.
As shown in the figure, by parallel combination:
S×I(n−1)=I×G
S=n−1G

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