JEE Mains · Physics · STD 12 - 3. current electricity
To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm . The least count of scale is 1 cm . The percentage error in the ratio of EMFs is ___________.
- A 1.45
- B 1.65
- C 1.75
- D 1.55
Answer & Solution
Correct Answer
(B) 1.65
Step-by-step Solution
Detailed explanation
\(\epsilon=\lambda \ell\) Potential gradient \(\epsilon_1=\lambda \ell_1\) \(\epsilon_2=\lambda \ell_2\) \(y =\frac{\epsilon_1}{\epsilon_2}=\frac{\ell_1}{\ell_2}\) \(\frac{\Delta y }{ y }=\frac{\Delta \ell_1}{\ell_1}+\frac{\Delta \ell_2}{\ell_2}\)…
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