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