Draw a shematic sketch of an a.c. generator describing its basi elements. State briefly its working principle. Show a plot of variation of magnetic flux

Draw a shematric sketch of an a.c. generator describing its basic elements. State briefly its working principle. Show a plot of variation of alternating e.m.f. Versus time generated by a lopp of wire rotating in a magnetic field.

Draw a schematic diagram of a cyclotron. Explain the underlying principle and working , stating clearly the function of the electric and magnetic fields applied to the charged particle. Deduce an expression for the period of revolution and show that it does not depend upon the speed of the charged particle.

In a series LCR circuit across an a.c source of variable frequency, obtain the expression for its impedance and draw a plot showing its variation with frequency of the a.c. source.

Draw a labelled diagram of a d.c. motor. State its principle and explain its working.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Plot a graph showing variation of net impedance of series combination of X and Y as a function of angular frequency of applied voltage.

Draw a simple circuit of a CE transistor amplifier. Explain its working. Show that the voltage gain, A_V of the amplifier is given by A_v = - ( beta_(ac) R_L )/(r_i) where beta_(Ac) is the current gain, R_L is the load resistance and r_1 is the input resistance of the transistor. What is the significance of the negative sign in the expression for the voltage gain?

A conductor of length 'l' is rotated about one of its ends at a constant angular speed omega in a plane perpendicular to a uniform magnetic field B. plot graphs to show variations of the emf induced across the ends of the conductor with length of the conductor l.