AP EAMCET · PHYSICS · Current Electricity
In a metre bridge experiment, the ratio of the left gap resistance to right gap resistance is \(2: 3\), the balance point from left is
- A \(60 \mathrm{~cm}\)
- B \(50 \mathrm{~cm}\)
- C \(40 \mathrm{~cm}\)
- D \(20 \mathrm{~cm}\)
Answer & Solution
Correct Answer
(C) \(40 \mathrm{~cm}\)
Step-by-step Solution
Detailed explanation
Here, \(\frac{P}{Q}=\frac{2}{3}\) We know \(\begin{aligned} \frac{P}{Q} & =\frac{l}{100-l} \\ \Rightarrow \quad \frac{2}{3} & =\frac{l}{100-l} \\ \Rightarrow \quad l & =40 \mathrm{~cm}\end{aligned}\)
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