AP EAMCET · PHYSICS · Current Electricity
Two wires \(A\) and \(B\) of same material having length \(L_A, L_B\) and radii \(R_A, R_B\) and drift velocity \(v_A, v_B\) respectively carries same current. If \(L_A=L_B\) and \(R_A=2 R_B\) then the value of \(\left(\frac{v_A}{v_B}\right)\) is
- A \(0.25\)
- B \(0.5\)
- C \(2.0\)
- D \(1.0\)
Answer & Solution
Correct Answer
(A) \(0.25\)
Step-by-step Solution
Detailed explanation
Current through a wire is given by \(I=n e v_d A=n e v_d \pi R^2\) Here, \(n\) = number density of free charge carriers \(v_d=\) drift speed of electrons \(R=\) radius of wire \(e=\) charge on an electron Here, for two wires \(A\) and \(B\)…
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