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Which of the following isn't true of an electric field?
Answer
An electric field can as well as does exist in vacuum. Except for the one about vacuum the entire the answers are part of the definition of the electric field. It is an electric field in the vacuum in a television picture tube which accelerates electrons to the front of the picture tube where they crash into a phosphorescent coating causing the latter to emit the light which we see as television images.
Explain about the piezoelectric effect. Piezoelectric effect: While crystals as quartz or tourmaline are stressed beside any pair of opposite faces, electric charges of oppo
A car travelling at 21 m/s misses the turnoff on the road and collides into the safety guard rail. The car comes to a totally stop in 0.55 s. a. What is the average accel
The voltage drops across two components when connected in series across an a.c. supply are v1 =150sin 314.2t and v2 =90sin(314.2t -∏/5) volts respectively. Determine (a) the v
why the reflective index of cladding is lower then in core of a fiber optic?
What is the hardness of water? How is it expressed? Hardness is the property of water which stops lather formation with soap. This is because of the presence of certain salts o
Write about the main features in which Fresnel and Fraunhoffer approaches of diffraction differ? Mention some (at least four) applications of diffraction.
MANUFACTURING: Nickel film is deposited on ceramic substrate. This is done by electrolytic deposition of nickel in a chemical bath containing hypophosphate. The sheet resistance i
The rate of modification of thermo emf with the change in the temperature of the hot junction is known as thermoelectric power.
The conductive method Heat can be transferred by conduction from warmer to cooler objects, the quantity of heat transfer depends on the temperature difference between the two
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