A non-uniform electric field is represented by `vecE = 5xhati Vm^(-1)` . An electric dipole having moment. `P = 20 xx 10^(-20)` cm is placed at an angle of 60° with the field. The net force on the dipole is.........N.

Options

A. `10^(-19) hati`
B. `100 xx 10^(-19)hati`
C. zero
D. `5 xx 10^(-19) hati`

Answer

D

Explanation

The net force exerts on a electric dipole in nonuniform electric field.
`=q(2a cos theta) (dvecE)/(dx)`

`=p costheta =(dvecE)/(dx)`
`=20 xx 10^(-20) xx cos 60^(@) xx 5hati (therefore vecE = 5xhati)`
`=5 xx 10^(-19) hati N`