CBSE Class 12-science Answered
A resistance R is connected across a cell of emf ε and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for 'r' in terms of ε, V and R.
Asked by Topperlearning User | 23 Apr, 2014, 04:20: PM
Expert Answer
As emf ε = I (r+R)
and pd = V = IR
Taking the ratio,
ε/V = (r+R)/R
ε = V(1+r/R)
r = R(ε/V - 1)
Answered by | 23 Apr, 2014, 06:20: PM
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