AP EAMCET · PHYSICS · Current Electricity
In a meter bridge experiment, when a nichrome wire is in the right gap, the balancing length is \(60 \mathrm{~cm}\). When the nichrome wire is uniformly stretched to increase its length by \(20 \%\) and again connected in the right gap, the new balancing length is nearly
- A \(61\ cm\)
- B \(31\ cm\)
- C \(51\ cm\)
- D \(41\ cm\)
Answer & Solution
Correct Answer
(C) \(51\ cm\)
Step-by-step Solution
Detailed explanation
Since \(\mathrm{R} \propto l\) \(\begin{aligned} & \therefore \frac{R_L}{R_R}=\frac{60}{100-60}=\frac{60}{40}=\frac{6}{4}=\frac{3}{2}... (i) \\ & \Rightarrow \frac{R_L}{144 R_R}=\frac{l}{100-l}... (ii) \end{aligned}\) From eqs. (i) and (ii)…
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