﻿ A sinusoidal voltage e = e0 Sin (wt) is fed to a common emitter

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# 41.A sinusoidal voltage e = e0 Sin (wt) is fed to a common emitter amplifier. Draw neatly labelled diagrams to show:(i) Signal voltage(ii) Output voltage of the amplifier.

Common emitter n-p-n transistor Amplifier:

Signal voltage

Common emitter p-n-p transitor Amplifier:

Output voltage of the ampifier:

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42. Make a truth table showing inputs at A and B and outputs at X, Y and Z for the combination of gates shown in figure below:

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43. With the help of a labelled diagram, obtain an expression for the electric field intensity ‘E’ at a point P in broad side position (i.e., equatorial plane) of an electric dipole.
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44. What is meant by ‘Chromatic aberration’? A thin convex lens of focal length 30 cm and made of flint glass (dispersive power = 0.03) is kept in contact with a thin concave lens of focal length 20 cm and made of crown glass. Calculate the dispersive power of crown glass if the above said combination acts as an achromatic doublet.
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45.

Electrons, initially at rest, are passed through a potential difference of 2 kV. Calculate their:

(i) Final velocity and

(ii) de Broglie wavelength.

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