A) \[1.00\,V{{m}^{-1}}\]
B) \[0.75\,V{{m}^{-1}}\]
C) \[0.50\,V{{m}^{-1}}\]
D) \[0.25\,V{{m}^{-1}}\]
Correct Answer: D
Solution :
Current in the potentiometer \[i=\frac{2}{8+7+1}=\frac{1}{8}A\] Voltage drop across potentiometer wire \[=\frac{1}{8}\times 8=1\,V\] \[\therefore \] Potential gradient of potentiometer wire \[=\frac{1}{4}=0.25\,V/m\]
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