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Communication Systems
A hemisphere is positively charged uniformly. The electric field at a point on a diameter away from the centre is directed
perpendicular to the diameter
parallel to the diameter
at an angle tilted towards the diameter
at an angle tilted away from the diameter
A.
perpendicular to the diameter
When the point is on the diameter and away from the centre of hemisphere which is charged uniformly and positively, the component of electric field intensity parallel to the diameter cancel out. So the electric field is perpendicular to the diameter.
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Give three reasons why the modulation of a message signal is necessary for long-distance transmission.
Show graphically an audio signal, a carrier wave and an amplitude modulated wave.
In a full wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
A hemisphere is positively charged uniformly. The electric field at a point on a diameter away from the centre is directed
What maximum frequency can be reflected from ionosphere?
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