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Current Electricity — Physics STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12PhysicsCurrent Electricity1 Mark
MCQ
When current I flows through a wire, the drift velocity of the electrons is v. When current 21 flows through another wire of the same material having double the length and area of cross-section, the drift velocity of the electrons will be-
  • A
    $\frac{v}{4}$
  • B
    $\frac{v}{2}$
  • ✓
    $v$
  • D
    $2 v$
✓

Answer

Correct option: C.
$v$
$v$
Hint: $ V _{ d }=\frac{1}{n A e} ; v _{ d }^{\prime}=\frac{2 I}{(2 A) n e}= v _{ d } $

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