Two indenticals particles, each having a charge of 2*10^-4C and mass of 10 g, are kept at a separation of 10 cm and then released. what would be the speeds of the particles when the separation becomes large?

ans: zer0

Since both the particles are identical and equal charges,hence force of repulsion will act and when released they will move in opposite direction with same velocity.With the increase in separation between them the velocity will tend to zero..and finally they will come to rest.

make use of concept of reduced mass ...

use conservation of momentam ..use conservation of energy , then u will see speed of both particles is same & in opposite direction ...

potential energy at infiite separation = 0...

Dear Pranshu,

 If u r taking air resistance, then only their velocities will be 0. Otherwise, u apply conservation of linear momentum & conservation of energy,

i.e.    M₁V₁=M₂V₂

 & 1/2M₁V₁² + 1/2M₂V₂² =KQ₁Q₂/r

 Hope u get it!!!!!

     Good Luck!!!!

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