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 and 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£ 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. \[\theta ={{0}^{o}}\] Hence, \[U=-pE\cos {{0}^{o}}=-pE\](minimum)You need to login to perform this action.
You will be redirected in
3 sec