Are the paths of electrons straight lines between successive collisions (with the positive ions of the metal) in the (i) absence of electric field, (ii) presence of electric field ?

Options

A. `sqrt((mv_(0)^(2))/(12k))`
B. `sqrt((mv_(0)^(2))/(5k))`
C. `sqrt((mv_(0)^(2))/(10k))`
D. None of these

Answer

(B)

Explanation

At maximum compression, velocity of all block are same & equal to velocity of centre of mass.
`(1)/(2)kx_(m)^(2) = [(1)/(2)mv_(0)^(2) + (1)/(2)(4m) ((v_(0))/(2))^(2)] - (1)/(2)(5m)((3v_(0))/(5))^(2) rArr (1)/(2)kx_(m)^(2) = (1)/(10)mv_(0)^(2) rArr x_(m) = sqrt((mv_(0)^(2))/(5k))`