A) \[320\,cm\]
B) \[120\,cm\]
C) \[20\,cm\]
D) \[450\,cm\]
Correct Answer: A
Solution :
In case of zero deflection in galvanometer \[{{V}_{AJ}}=\frac{\varepsilon }{2}\] \[\Rightarrow \] \[1{{R}_{AJ}}=\frac{\varepsilon }{2}\] \[\Rightarrow \] \[\left( \frac{\varepsilon }{15r+r} \right)\,\left( \frac{15r}{600} \right)AJ=\frac{\varepsilon }{2}\] \[\left[ As,\,\,i=\frac{\varepsilon }{15r+r}and\,{{R}_{AJ}}\left( \frac{15r}{600}AJ \right) \right]\] \[\Rightarrow \] \[AJ=320\,cm\]
You need to login to perform this action.
You will be redirected in
3 sec
