A) \[10\,\,m\Omega \] resistance is to be connected in parallel to the galvanometer
B) \[10\,\,m\Omega \] resistance is to be connected in series with the galvanometer
C) \[0.1\,\,\Omega \] resistance is to be connected in parallel to the galvanometer
D) \[0.1\,\,\Omega \] resistance is to be connected in series with the galvanometer
Correct Answer: A
Solution :
[a] \[G=15\,\Omega ,\,\,{{i}_{g}}=4\,m\,A,\,\,i=6\,A\] Required shunt, \[S=\left( \frac{{{i}_{g}}}{i-{{i}_{g}}} \right)G=\left( \frac{4\times {{10}^{-3}}}{6-4\times {{10}^{-3}}} \right)\times 15\] \[=\frac{4\times {{10}^{-3}}}{5.996}\times 15\] \[=10\,m\,\Omega \](in parallel)
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