To find the resistance of galvanometer by the half deflection method the following circuit is used with resistances \[{{\operatorname{R}}_{1}}=9970\Omega ,{{\operatorname{R}}_{2}}=30\Omega \] and \[{{\operatorname{R}}_{3}}=0\]. The deflection in the galvanometer is d. With \[{{\operatorname{R}}_{3}}=107\Omega \]the deflection changed to \[\frac{\operatorname{d}}{2}.\] The galvanometer resistance is approximately: [JEE ONLINE 22-04-2013] |
A) \[107\Omega \]
B) \[137\Omega \]
C) \[107/2\Omega \]
D) \[77\,\Omega \]
Correct Answer: D
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