Question

Two charges of `+- 1000 muC` are separated by `2mm`. This dipole so formed is held at an angle of `30^(@)` with a uniform electric field of `15xx10^(4) N//C`. Calculate the torque acting on the dipole.

Answer 1

Here, `q = +- 1000 mu C = +- 1000xx10^(-6) C, 2a = 2mm = 2xx10^(-3) m, theta = 30^(@)`
`E = 15xx10^(4) N//C, tau = ?`
`tau = p E sin theta = q(2a) E sin theta = 10^(-3)xx2xx10^(-3)xx15xx10^(4) sin 30^(@)`
`tau = 2xx15xx10^(-2)xx(1)/(2) = 0*15N.m`