Question

An electric dipole of dipole moment `4xx10^(-5)` Cm is placed in a uniform electric field of `10^(-3) N//C` making an angle of `30^(@)` with the direction of the field. Determine the torque exerted by the electric field on the dipole.

Answer 1

Here, `p = 4xx10^(-5) C.m`,
`E = 10^(-3) N//C, theta = 30^(@)`
`tau = pE sin theta`
`= (4xx10^(-5)) 10^(-3) sin 30^(@)`
`= 2xx10^(-8) N.m`