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The drift velocity of the electrons in...

The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of 220 V is `0.5ms^(-1)` . Their mobility (in `m^(2)V^(-1)s^(-1))`

A

a)`2.5xx10^(-3)`

B

b)`2.5xx10^(-2)`

C

c)`5xx10^(2)`

D

d)4.5x10^-(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Drift velocity = mobility `xx` intensity of electric field
or `v_(d)=muEormu=(v_(d))/(E)`
`ormu=(v_(d))/(V//l) " " (becauseE=(V)/(l))`
`thereforemu=(0.5xx2)/(220)=4.5xx10^(-3)`
`~~5xx10^(-3)m^(2)V^(-1)s^(-1)`
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