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Question
Sensitivity of moving coil galvanometer is 'S'. If shunt of `1/8` th of the resistance of galvanometer is connected to moving coil galvanometer, its sensitivity becomes ______.
Options
`"S"/3`
`"S"/6`
`"S"/9`
`"S"/12`
MCQ
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Solution
Sensitivity of moving coil galvanometer is 'S'. If shunt of `1/8` th of the resistance of galvanometer is connected to moving coil galvanometer, its sensitivity becomes `underlinebb("S"/9)`.
Explanation:
S = `"G"/8` (Given) ...(i)
And, S = `"G"/("n"-1)` ...(ii)
From eqs. (i) and (ii),
`"G"/8="G"/("n"-1)` ⇒ 8 = n - 1
∴ n = 8 + 1 = 9
Since, the range of galvanometer is increased by 9 times, therefore its sensitivity reduces to `"S"/9`
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