COMEDK · Physics · 19. Current Electricity
The resistance of a galvanometer is \(2.5 \Omega\) and it requires \(50 \mathrm{~mA}\) for full scale deflection. The value of shunt resistance required to convert it into an ammeter of range 0 to \(5 \mathrm{~A}\) is
- A \(2.5 \times 10^{-2} \Omega\)
- B \(0.25 \times 10^{-2} \Omega\)
- C \(0.025 \times 10^{-2} \Omega\)
- D \(0.0025 \times 10^{-2} \Omega\)
Answer & Solution
Correct Answer
(A) \(2.5 \times 10^{-2} \Omega\)
Step-by-step Solution
Detailed explanation
Given, resistance of galvanometer, \(R_{g}=2.5 \Omega\) Full scale deflection current, \[ \begin{aligned} I_{g} &=50 \mathrm{~mA}=50 \times 10^{-3} \mathrm{~A} \\ &=0.05 \mathrm{~A} \end{aligned} \] Range of galvanometer is \((0-5) A\) \[ \therefore \quad I=5 \mathrm{~A} \] If…
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