JEE Mains · Physics · STD 12 - 3. current electricity
In a potentiometer arrangement, a cell of emf \(1.20\, V\) gives a balance point at \(36\, cm\) length of wire. This cell is now replaced by another cell of emf \(1.80\, V\). The difference in balancing length of potentiometer wire in above conditions will be \(....cm\).
- A \(17\)
- B \(18\)
- C \(16\)
- D \(12\)
Answer & Solution
Correct Answer
(B) \(18\)
Step-by-step Solution
Detailed explanation
\(1.2=(\) Potential Gradient \() \times 36\) \(1.8=(\) Potential Gradient \() \times x\) On dividing, we get \(\frac{2}{3}=\frac{36}{x}\) \(x=18 \times 3=54\,cm\) Hence difference \(=54-36=18\,cm\)
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