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Suppose the drift velocity v_{d} in a material varied with the applied electric field E as v_{d}\, \alpha \, \sqrt{E} Then V - I graph for a wire made of such a material is best given by :


  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)


Answers (3)


As we learnt in

Vd is directly proportional to E -

v_{d} \alpha E  :

greater the electric field larger will be the drift velocity.



I=ne\Delta V_{d}

Given V_{d}\propto \sqrt{e}   or\: i\propto \sqrt{E}

i^{2}\propto E\: or\:i^{2}\propto V

Option 1)

This option is incorrect 

Option 2)

This option is incorrect 

Option 3)

This option is correct 

Option 4)

This option is incorrect 

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