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AP EAMCET2016PhysicsCurrent 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

Options

  1. Av
  2. B>v
  3. C< v
  4. Dzero

Correct answer

A. v

Step-by-step solution

The drift velocity, aligned & v_a= 1 n e A = V n e A ( l= V R ) & v_d= V l A n e A ( R= l A ) & v_d= V l n e aligned As drift velocity is independent of cross-sectional area (A) so no change in drift velocity.

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