An electric dipole with dipole moment `4 xx 10^(-9)` Cm is aligned at 30° with the direction of a uniform electric field of magnitude `5 xx 10^4 NC^(-1)`. Calculate the magnitude of the torque acting on the dipole.

Explanation

Torque exerted on given dipole,
`vec(tau) = vecp xx vecE`
`therefore tau = pEsin theta`
`=(4 xx 10^(-9)) (5 xx 10^(4))sin 30^(@)`
`tau = 10^(-4) Nm` (In the direction of `vecp xx vecE`)