how do the resistance and drift velocity changes if:a)V(potential difference) is doubled b)lentgh is doubled c)area is halved of a conducting rod

Asked by  | 3rd May, 2013, 10:51: PM

Expert Answer:

 
vd=eE?/m=eV?/ml
So if (1)V is doubled then the drift velocity also doubles.
(2)l is doubled then dr vel decreases.
(3)dr vel is independent of area of cross section.
 
Resistance (R=ml/ne2A?)of the conductor (1)does not change with the applied V.
(2) R gets doubled as length doubles.
(3)gets doubled as area of cross section gets halved.
 
 

Answered by  | 6th May, 2013, 11:22: AM

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