The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?
Correct answer: D. 12Ω
- A. 18Ω
- B. 30Ω
- C. 24Ω
- D. 12Ω
Explanation
The deflection falls from 50 divisions to 25 divisions, so the galvanometer current becomes half its original value. With a shunt of 12 Ω, equal current division requires the galvanometer resistance to equal the shunt resistance: G = 12 Ω. The likely wrong choice is a, which can result from using the shunt relation incorrectly.
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