1. The problem statement, all variables and given/known data The ammonia molecule (NH3) has a dipole moment of 5.0×10−30C⋅m. Ammonia molecules in the gas phase are placed in a uniform electric field E⃗ with magnitude 1.0×106N/C. What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to E⃗ from parallel to perpendicular? 2. Relevant equations V = U/q ΔU = -integral([itex]qE dl[/itex]) ΔV = -integral([itex]E dl[/itex]) E(r) = -∇V(r) I have no idea what the upside down delta is... 3. The attempt at a solution I don't even know where to start.