COMEDK · Physics · 19. Current Electricity
In a meter bridge a copper coil is connected in the right gap and a resistance of \(10 \Omega\) in the left gap. The balance point is obtained at \(0.2 \mathrm{~m}\). The resistance of the coil is
- A \(40 \Omega\)
- B \(5 \Omega\)
- C \(20 \Omega\)
- D \(2.5 \Omega\)
Answer & Solution
Correct Answer
(A) \(40 \Omega\)
Step-by-step Solution
Detailed explanation
Given, \(P=10 \Omega, l=0.2 \mathrm{~m}\) In balanced condition of meterbridge, \(\frac{P}{Q}=\frac{l}{(1-\bar{l})}\) \(\Rightarrow \quad \frac{10}{Q}=\frac{0.2}{1-0.2}=\frac{0.2}{0.8}\) \(\Rightarrow \quad Q=40 \Omega\)
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