CUET · PHYSICS · PYQ PAPER 2025
A galvanometer shows full scale deflection for a current of 4 mA. It is converted into an ammeter of range from 0 to 8
A by using a shunt. The ratio of resistance of the galvanometer coil to the resistance of the shunt used is nearly:
- A \(2000 : 1\)
- B \(1:2000\)
- C \(1000: 1\)
- D \(1 : 1000\)
Answer & Solution
Correct Answer
(A) \(2000 : 1\)
Step-by-step Solution
Detailed explanation
\(I_g R_g = (I - I_g) R_s\) \(\frac{R_g}{R_s} = \frac{I - I_g}{I_g}\) \(\frac{R_g}{R_s} = \frac{8 \text{ A} - 4 \times 10^{-3} \text{ A}}{4 \times 10^{-3} \text{ A}}\) \(\frac{R_g}{R_s} = \frac{7.996}{0.004} = 1999\) Ratio is approximately \(2000:1\).
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