An electric dipole is placed in a uniform electric field` vec E` of the magnitude `40 NC^(-1)`. Graph shows of the magnitude of the torque on the dipole versus the angle `theta` between the field `vecE` and the dipole moment `vec p`. The magnitude of dipole moment `vec P` is equal to

Options

A. `1.25xx10^(-28) C-m`
B. `2.0xx10^(-25)C-m`
C. `2.5xx10%^(-28)C-m`
D. `5.0xx10^(-28)C-m`

Answer

A

Explanation

`vectau=vecpxxvecErArrtau_("max")=pE rArr50xx10^(-28)=p.40`
`rArrp=1.25xx10^(-28)C-m`