State the principle of an ac generator.

(a) State the principle of an ac generator and explain its working with the help of a labelled digram. Obtain the expression for the emf induced in a coil having N turns each of cross-section area. A, rotating with a constant angular speed omega in a magnetic filed omega , directed prependicular to the axis of rotation. (b) An aeroplane if flying horizontally for west to east with a velocity of 900 km/hours. Calcuate the potential difference developed between the ends of its wings having a span of 20n. The horizontal component of the Earth's magnetic field is 5 xx 10^(-4) T and the angle of dip is 30^(@) .

a) State the principle of ac generator. b) Explain with the help of a well labelled diagram, its working and obtain the expression for the emf generated in the coil. c) Is it possible to generate emf without rotating the coil? Explain

State the principle of an electric generator.

State the principle of moments.

State the principles of electric motor and electric generator.