An electromagnetic generator consists of a coil that has 100 turns of wire, has an area of 400 cm2, and rotates at 60 rev/ s in a magnetic field of 0.25 t directed perpendicular to the rotation axis. what is the magnitude of the emf induced in the coil?

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.