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

(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^(@) .

Explain the principle and working of a cyclotron with the help of a schematic diagram. Write the expression for cyclotron frequency.

What is the instantaneous value of induced emf generated in the coil of AC generator ?

Describe the working of an AC generator with the help of a labelled circuit diagram. What charges must be made in the arrangement to convert it to a DC generator?