AP EAMCET · PHYSICS · Current Electricity
When a long straight uniform rod is connected across an ideal cell, the drift velocity of electrons in it is \(v\). If a uniform hole is made along the axis of the rod and the same battery is used, then the drift velocity of electrons becomes
- A \(v\)
- B \(>v\)
- C \( < v\)
- D \(zero\)
Answer & Solution
Correct Answer
(A) \(v\)
Step-by-step Solution
Detailed explanation
The drift velocity, \(\begin{aligned} & v_a=\frac{1}{n e A}=\frac{V}{n e A}\left(\because l=\frac{V}{R}\right) \\ & \therefore v_d=\frac{V}{\rho \frac{l}{A} n e A}\left(\because R=\rho \frac{l}{A}\right) \\ & \therefore v_d=\frac{V}{\rho l n e} \end{aligned}\) As drift velocity…
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