1.
Let A⃗\vec{A} be a constant vector of magnitude AA and E⃗\vec{E} be a vector perpendicular to A⃗\vec{A} such that dE⃗dt=A⃗×E⃗\dfrac{d\vec{E}}{dt}=\vec{A}\times\vec{E}. Which statement about the motion of E⃗\vec{E} is correct?