AP EAMCET · PHYSICS · Current Electricity
Wires \(A\) and \(B\) have resistivities \(\rho_A\) and \(\rho_B\), \(\left(\rho_B=2 \rho_A\right)\) and have lengths \(l_A\) and \(l_B\). If the diameter of the wire \(B\) is twice that of \(A\) and the two wires have same resistance, then \(\frac{l_B}{l_A}\) is
- A \(2\)
- B \(1\)
- C \(\frac{1}{2}\)
- D \(\frac{1}{4}\)
Answer & Solution
Correct Answer
(A) \(2\)
Step-by-step Solution
Detailed explanation
The given, \[ \rho_B=2 \rho_A, R_A=R_B=R \] Let, \(r_A=r\) \[ r_B=2 r \] According to formula,…
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