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
B
R4
C
R3
D
4 R

Solution

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

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