Potential energy in ELECTRIC DIPOLES

[orthovector]

Homework Statement

IF THERE IS A MAXIMUM TORQUE WHEN THETA = 90 DEGREES BETWEEN ANGLE MADE BY THE DIPOLE VECTOR P AND THE ELECTRIC FIELD VECTOR E, WHY IS IT CONVENTION TO NOTE THE POTENTIAL ENERGY OF THE DIPOLE AT THETA = 90 DEGREES IS 0?

SHOULDN'T THE POTENTIAL ENERGY AT THETA = 90 DEGREES BE A MAXIMUM AND MINIMUM WHEN THETA = 0 DEGREES (P VECTOR IS PARALLEL WITH E VECTOR)

Homework Equations

The Attempt at a Solution

 

[orthovector]

Homework Statement

if there is a maximum torque when theta = 90 degrees between angle made by the dipole vector p and the electric field vector e, why is it convention to note the potential energy of the dipole at theta = 90 degrees is 0?

Shouldn't the potential energy at theta = 90 degrees be a maximum and minimum when theta = 0 degrees (p vector is parallel with e vector)

Homework Equations

The Attempt at a Solution

help

 

[orthovector]

oh i got it. sorry, maximum potential energy is when the positive end of dipole is closest to the electrical field.