  We find that the bulk moment of inertia per unit volume of a metal becoming
superconducting increases by the amount $m_e/(\pi r_c)$, with $m_e$ the bare
electron mass and $r_c=e^2/m_e c^2$ the classical electron radius. This is
because superfluid electrons acquire an intrinsic moment of inertia $m_e
(2\lambda_L)^2$, with $\lambda_L$ the London penetration depth. As a
consequence, we predict that when a rotating long cylinder becomes
superconducting its angular velocity does not change, contrary to the
prediction of conventional BCS-London theory that it will rotate faster. We
explain the dynamics of magnetic field generation when a rotating normal metal
becomes superconducting.
