A) \[200\,\Omega \]
B) \[100\,\Omega \]
C) \[500\,\Omega \]
D) \[1000\,\Omega \]
Correct Answer: B
Solution :
The galvanometer shows zero deflection i.e., current throughis zero. As a result potential drop acrossis 2V, circuit can be redrawn as \[l=\frac{12}{500+R}\] Voltage across R, \[V=lR\] \[\Rightarrow \,\,2=\frac{12}{500+R}\times R\] \[\Rightarrow \,\,1000\,+2R=12R\,\Rightarrow R=100\Omega \]You need to login to perform this action.
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