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Modulation is the process of superimposing message signal on carrier wave. Need:· Prevent signal loss· Allow long-distance transmission · Reduce antenna size
· Travel at speed of light· Transverse in nature· Don’t require medium Uses:· Radio waves → communication · X-rays → medical imaging
· 1st Law: A changing magnetic flux induces an emf.· 2nd Law:Induced emf=−dϕ / dt Negative sign = Lenz's law (opposes the change).
The magnetic field of a long solenoid resembles that of a bar magnet — it has a north and south pole and similar field line patterns.
· Kirchhoff’s Current Law (KCL): Total current entering a junction = total current leaving.· Kirchhoff’s Voltage Law (KVL): Algebraic sum of all potential differences in a closed loop is zero. Used i...
· Two fundamental laws govern reflection.The angle of incidence (I) equals the angle of reflection (r).At the point of incidence, the incident ray, reflected ray, and the normal to the reflecting surface lie i...
The convex lens's focal length cannot be reduced by a more significant amount. This is because making lenses having tiny focal lengths is not easy. Spherical and chromatic aberrations are created by a convex le...
Yes, the angular magnification varies. When the length between the eye and a magnifying glass rises, the angular magnification reduces slightly because the subtended angle at the eye is imperceptibly less than the le...
Though the image size is larger than the object, the angular size of the image is equivalent to the angular size of the object. A magnifying glass supports one seeing the objects closer than the least distance of dist...
As the choke coil reduces the voltage across the tube without wasting much power, it is used in the fluorescent tubes with ac mains. An ordinary resistor cannot be used instead of choke coil because it wastes power in...
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