A) \[20\,\Omega \]
B) \[2\,\Omega \]
C) \[0.2\,\,\Omega \]
D) \[2\,k\Omega \]
Correct Answer: B
Solution :
Key Idea The potential difference across ammeter and shunt is same. Let \[{{i}_{a}}\]is the current flowing through ammeter and \[i\]is the total current. So, a current \[i-{{i}_{a}}\]will flow through shunt resistance. Potential difference across ammeter and shunt resistance is same. ie, \[{{i}_{a}}\times R=(i-{{i}_{a}})\times S\] or \[S=\frac{{{i}_{a}}R}{i-{{i}_{a}}}\] ?(i) Given, \[{{i}_{a}}=100A,i=750A,R=13\,\Omega \] Hence, \[S=\frac{100\times 13}{750-100}=2\,\Omega \]You need to login to perform this action.
You will be redirected in
3 sec