The torque on an electric dipole in a uniform electric field is related to the vector product of which two vector quantities?
Correct answer: A
The torque on an electric dipole in a uniform electric field is given by the vector equation τ⃗ = p⃗ × E⃗. Its magnitude is τ = pE sin θ, and its direction is perpendicular to the plane containing p⃗ and E⃗, determined by the right-hand rule. Thus the relevant vector product is between dipole moment and electric field, so option A is correct. The other pairs do not describe electrostatic dipole torque.