A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is

Question

A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is (A)  (π /4)  (B)  (π /2)  (C)  π  (D) zero

Tardigrade Admin · Accepted Answer

Dipole energy U=-pE cos θ When U is maximum cos θ =-1 θ =π

Q. A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If $θ$ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when $θ$ is

$\frac{π}{4}$

$\frac{π}{2}$

$π$

zero

$\frac{2}{3} π$

Dipole energy
$U = - pE cos θ$ When U is maximum $cos θ = - 1$
$θ = π$

Q. A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is

4π​

2π​

π