A) \[4\times {{10}^{-1}}V\]
B) \[2\times {{10}^{-3}}V\]
C) \[4\times {{10}^{-3}}V\]
D) \[2\times {{10}^{-1}}V\]
Correct Answer: C
Solution :
Current taken from the cell \[i=\frac{E}{R+r}\] where\[E=\]emf of cell \[R=\]external resistance \[r=\]internal resistance \[\therefore \] \[i=\frac{2}{998+2}=\frac{1}{500}A\] Error in value of emf = Actual value of emf - measured emf Measured emf \[V=E-ir\] \[=2-\frac{1}{500}\times 2\] \[=2-\frac{1}{250}\] \[\therefore \] Error\[=2-\left( 2-\frac{1}{250} \right)=\frac{1}{250}\] \[=4\times {{10}^{-3}}V\]
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