A molecule that acts as a permanent dipole is in a uniform electric field. The electric field
has magnitude E and direction as shown. The dipole is made up of two opposite charges,
+q and -q, separated by a distance d. How much work would you need to do on the
molecule in order to rotate it 90º about its center? Assume the dipole is at rest before and
after you rotate it.
O +2qEd
O -qEd
O -2qEd
+qEd
O Zero
+
d
↓
+