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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
What is Avalanche Breakdown Minority carriers, under reverse biased conditions, flowing through the junction acquires a kinetic energy that increases with increase
A copper rod which is 1 centimetre in diameter carries a current of 5 amps. The current is distributed uniformly over the rod. The magnetic field half way among the axis o
Calculate the luminosity for a beam of protons of 1uA colliding with a stationary liquid hydrogen target 30cm long. Compare this to a typical colliding beam luminosity of 10e34 cm-
Explain Chemical Potential of Ideal Gas? Derive the expression for the chemical potential and Gibbs free energy of N molecules of an ideal gas at temperature T, pressure P and
The units that may be derived from fundamental units are known as derived units.
Illustrate "Tangent law" in magnetism. Compare magnetic moment of two bar magnet in a tan A, tan B position by null method or equal distance method.
An atom in a solid state has no degrees of freedom for transnational and rotational speed. At great temperatures due to vibration along 3 axes it has 3 Χ2(directions) = 6 degrees
calculating the distance in effective handle.
Q. What is artificial radioactivity? The phenomenon by which still light elements are made radioactive by artificial or induced methods is called artificial radioactivity. α
The emf of the driver cell of a potentiometer is 2V & its internal resistance is negligible . The length of the potentiometer wire is 100cm & resistance is 5 ohm.How much resistanc
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