R - Galileo and Einstein

Torque on a Dipole in an Electric Field
• For a dipole +Q, -Q
separated by a distance
as shown, the dipole
moment is defined as a
vector length p
Q
and direction along the
line from –Q to +Q.
• The torque
2 QE / 2 sin pE sin ,
• d
F
QE
p
-Q
+Q
F
QE
pE.