Question

A potentiometer wire of length \(10\) m and resistance \(9\,\Omega\) is connected to a cell of emf \(E\) and internal resistance \(1\,\Omega\). If \(V\) is the maximum potential difference that can be measured using the potentiometer, then the condition for the potentiometer to work is

• A. \(E=V\)
• B. \(9E\ge10V\)
• C. \(E<V\)
• D. \(9V=10E\)

Hint:

For a potentiometer, \[ \boxed{ V_{\max}=IR_{\text{wire}}. } \] The unknown potential difference must always satisfy \[ \boxed{ V\le V_{\max}. } \]

Answer 1

The Correct Option is B