A) 2qE and minimum
B) qE and pE
C) zero and minimum
D) qE and maximum
Correct Answer: C
Solution :
An electric dipole is an arrangement of two equal an opposite charges placed at a distance \[2l.\]The dipole is placed in electric field as such its dipole moment is in direction of electric field as shown in figure Now force on the charge q is\[{{F}_{2}}=qE\]along the direction of E and force on charge\[-q\]is \[{{F}_{1}}=-qE\] in the direction opposite to E. Since, forces on the dipole are equal and opposite, so net force on the electric dipole is zero. Now potential energy of the dipole. \[U=-pE\,cos\theta \] where\[\theta \]is the angle between direction of electric field and direction of dipole moment. \[\therefore \] \[\theta =0{}^\circ \] Hence, \[U=-pE\text{ }cos\text{ }0{}^\circ =-pE\] (minimum)You need to login to perform this action.
You will be redirected in
3 sec