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AP EAMCET202315 May 2023Evening ShiftPhysicsCurrent ElectricityActual

The drift velocity of electrons in a conducting wire connected to a cell is V _ d . If the length of the wire is doubled and area of cross-section is halved then the drift velocity of electrons becomes.

Options

  1. AV _ d
  2. BV_d 2
  3. C2 ~V _ d
  4. D4 V_d

Correct answer

B. V_d 2

Step-by-step solution

Drift velocity is given by aligned & v _ d = I neA & v _ d = V neAR ( V = IR ) & = VA neA R = A & = V ne & V _ d ^ = V ne 2 = V _ d 2 aligned

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