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Since polymeric materials can be formed in thin, highly uniform and non porous films with high dielectric strength, these materials are preferred dielectric materials for capacitors. These capacitors are characterised by high insulation resistance at room temperature.
They are made of:
(a) Polystyrene film capacitor
(b) Poly terafluoroethlylene capacitors (P.T.F.E.)
(c) Polythene terephthalate (milliner) capacitors
Determne the magnetic field due to a finit sraight wire of length 2l, carrying a steady current i. The point of interest P is l distance away from the middle point of wire O. So
A negative point charge 10 -8 coulomb is located in air at the origin of a rectangular coordinate system. What is the electric field intensity at a point on the positive x directi
Figure shows the magnetic circuit of a relay. When each of the air gaps are 1.5mm wide find the mmf required to produce a flux density of 0.75 T in the air gaps. Use the B-
D- Ultrasonic wave Heating These waves are different from electromagnetic waves . It produces mechanical vibration inside tissue. It is the same as the sound waves but it has
Superposition principle The general idea is that, while a number of influences are working on a system, the total influence on that system is just the sum of the individual in
The width of the central bright band of a diffraction pattern is 2.9 cm. Laser light of unknown wavelength passes through a single slit that is 0.042 mm wide and onto a screen
a boy jumps from height of 100m?what will be its velocity when it reaches ground?
How can I create an acceleration graph with my results?
An object is placed at a distance of 0.12m from a convex lens forms an image at a distance of 0.18m. Determine the magnification produced.
Write two characteristic features of nuclear force which differentiate it from the Coulomb force.
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