Questions
A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2, respectively. If the mean drift velocity of electrons in sections P and Q is denoted by and respectively, then
detailed solution
Correct option is C
Drift velocity νd =ineA ⇒ νd ∝1A or νd ∝1d2⇒νPνQ=dQdP2 = d/2d2 = 14 ⇒νP =14νQTalk to our academic expert!
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A potential difference is applied across the ends of a metallic wire. If the potential difference doubled, the drift velocity
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