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  • A galvanometer gives full scale deflection with current . when it is connected to <i

A galvanometer gives full scale deflection with current 0.004 \mathrm{~A}. when it is connected to 6800 \Omega resistance, it can be converted into voltmeter of range 0-30 \mathrm{~V}. If connected to a x \Omega resistance, it becomes an ammeter of range 0-1.5\ A. The value of x is:-

Option: 1

1.48\Omega


Option: 2

1.43\Omega


Option: 3

1.33\Omega


Option: 4

0.43\Omega


Answers (1)

best_answer

\begin{aligned} & V=I g(R+g) \\ & \Rightarrow 30=0.004(R+g) \\ & \Rightarrow R+g=\frac{30}{0.004} \\ & \Rightarrow R+g=7500 \\ & \Rightarrow g=7500-6800=700 \Omega \\ & I_g G=\left(I-I_g\right) g \\ & 0.004 \times 700=(1.5-0.004) \mathrm{s} \\ & S=\frac{0.004 \times 700}{1.496}=1.43 \Omega \end{aligned}

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sudhir kumar

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