A very small circular loop of area 5×10^–4 m² resistance 2Ω and negligible inductance is initially coplanar and concentric with a much larger fixed circular loop of radius 0.1m. A constant current of 1 ampere is passed in larger loop and smaller loop is rotated with a angular velocity ‘$\mathrm{\omega }$’ rads^–1 about its diameter. The induced emf is ___ ×10^–9V