Two small balls having equal positive charge `Q`(coulomb) on each are suspended by two insulated string of equal length `L` meter, from a hook fixed to a stand. The whole gravity (state of weightlessness). Then the angle between the string and tension in the string is `

Options

A. `180^(@),1/(4piepsilon_(0))*(Q^(2))/((2L)^(2))`
B. `90^(@),1/(4piepsilon_(0)).(Q^(2))/(L^(2))`
C. `180^(@), 1/(4piepsilon_(0)).(Q^(2))/(2L^(2))`
D. `180^(@), 1/(4piepsilon_(0))*(Q^(2))/(4L^(2))`

Answer

a

Explanation

In case of weightlessness, following situation arises

So angle `theta= 180^(@)` and force `F=1/(4pit_(0))*(Q^(2))/((2L)^(2))`