A constant potential difference is applied between the ends of the wire. If the length of the wire is elongated 4 times, then the drift velocity of electrons will be

Options

A. increases 4 times
B. decreases 4 times
C. increases 2 times
D. decreases 2 times

Answer

A

Explanation

The drift velocity in inversely proportional to the length(l) of wire
`v_(d)prop(1)/(l) (v_(d_1))/(v_(d_2))=(l_2)/(l_1)=(4l)/(l)`
Here, `l_(1) "and" l_(2)` are the lengths of wire in two conditions
`Rightarrowv_(d_1):v_(d_2)=4:1`