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Question

The resistance of a galvanometer coil is $$R$$. What is the shunt resistance required to convert it into an ammeter of range $$4$$ times


A
R5
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B
R4
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C
R3
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D
4 R
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Solution

The correct option is C $$\dfrac{R}{3}$$
According to the question,
$$\dfrac{i}{i_g}=1+\dfrac{G}{S} \Rightarrow \dfrac{4}{1}=1+\dfrac{R}{S} \Rightarrow S=\dfrac{R}{3}$$

Physics
NCERT
Standard XII

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