Physics

ICSE Class 12

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41.

A sinusoidal voltage e = e_{0} Sin (wt) is fed to a common emitter amplifier. Draw neatly labelled diagrams to show:

(i) Signal voltage

(ii) Output voltage of the amplifier.

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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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Electric field intensity at a point on the broad side-on position equatorial line: Consider an electric dipole consisting of two equal but opposite charges -q and +q separated by a vector distance 2l. Let P be a point at a distance r from the centre of the dipole O. The electric intensity at P due to the dipole is the vector sum of the field due to the charge -q at A and +q at B.

Electric intensity at P due to - q = E

But AP

where AO = OB = l

Magnitude of E

The resultant intensity is the vector sum of.

E

The y-components of the fields cancel each other because E

From the above two equations for E

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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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