AP EAMCET · PHYSICS · Current Electricity
A galvanometer has a coil of resistance \(100 \Omega\) showing a full scale deflection at \(50 \mu \mathrm{A}\). The resistance that should be added to use it as an ammeter of range \(10 \mathrm{~mA}\) is
- A \(5 \Omega\)
- B \(5 \times 10^{-2} \Omega\)
- C \(0.5 \Omega\)
- D \(1 \Omega\)
Answer & Solution
Correct Answer
(C) \(0.5 \Omega\)
Step-by-step Solution
Detailed explanation
Given, Resistance of galvanometer \[ \begin{aligned} R_g & =100 \Omega \\ I_g & =50 \mu \mathrm{A}=5 \times 10^{-5} \mathrm{~A} \\ I & =10 \mathrm{~mA}=10^{-2} \mathrm{~A} \\ R_s & =? \end{aligned} \] We know that, \[ R_s=\frac{I_g}{I-I_g} \times R_g . \]…
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