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group velocity and phase velocity
Q. Define: the temperature coefficient of resistance. The ratio of raise in resistance per degree rise in temperature to its resistance at 0 o C is called as temperature coeff
Q. What is Coulomb? One Coulomb is describe as the quantity of charge which when placed at a distance of 1 metre in air or vacuum from an equal and similar charge experiences a
A serviceable spring balance The quality of rubber deteriorates rather rapidly in unfavourable climatic conditions; a coiled steel spring is preferable. The pattern defined ha
Electric field (intensity) is a vector number. Electric field because of a positive particle is always away from the charge and that because of a negative charge is always toward
Peltier effect (J.C.A. Peltier; 1834) The change in temperature generated at a junction among two dissimilar metals or semiconductors while an electric current flow through the
Starting from Maxwell's electromagnetic equations in vacuum, get the wave equations for the four fields vectors E, D, B and H.
Laboratory steelyard To make a steelyard weighing to 500 g use a wooden lath only one metre long balanced on a strong sewing needle stuck by it 3mm from its upper edge and 12 c
What is Vapor Density? Vapour density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of
You are offered with two strips of metallic foil two strips of waxed paper and two metal paper clips. Every strip is in the shape of a rectangle 2 inches wide and 5 feet long. Whic
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