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 2 V, 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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