AP EAMCET · PHYSICS · Current Electricity
In a balanced meter bridge, the segment of wire opposite to a known resistance of \(70 \Omega\) is \(70 \mathrm{~cm}\). The unknown resistance is
- A \(30 \Omega\)
- B \(60 \Omega\)
- C \(90 \Omega\)
- D \(15 \Omega\)
Answer & Solution
Correct Answer
(A) \(30 \Omega\)
Step-by-step Solution
Detailed explanation
In balanced meter bridge known resistance, \(S=70 \Omega, l=70 \mathrm{~cm}\) \(\therefore\) Unknown resistance, \(R=S\left(\frac{100-l}{l}\right)=\frac{70(100-70)}{70}=30 \Omega\)
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