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The world is derived from the Greek world which means to squeeze or press. It is usually described as the generation of electricity as a result of mechanical pressure. "When mechanical pressure is applied to any one of these materials, the crystalline structure generates a voltage which is proportional to the pressure." On the other hand when an electric field is applied, the structure changes shape creating dimensional alterations in the material only if the lattice owns no centre of symmetry, the phenomenon being called as piezoelectricity. This property is found in certain classes of crystalline materials including natural crystals of Quartz, Rochelle salt and tourmaline plus manufactured ceramics such as barium and lead
This special crystal structure has no centre of symmetry. This unit cell has a centre of symmetry. When unstressed the centre of the mass of the negative charges at the centre as shown. There is therefore no net polarization in the unit cell and p=0 when a mechanical force is applied to the cell in which the second row of charges is a line of symmetry. The distance between the second and third; the centre of mass of the negative charges still coincides with the positive charge. Hence, there is no change in the electric. This result is generally true for all crystal that has a centre of symmetry.
Determine the Shear Force in kN rounded to 1 DP and Bending Moment in kN.m rounded to 1 DP at point C in the beam when the UDL on the beam is P52 kN/m (as for the previous question
When the economy experiences a downfall, the government knows exactly which policies will spur an economic recovery. Often policymakers fail to take the right decisions for both
Q. If a dog rolled around on a carpet as well as gets statically and a flea jumps on it will the flea get electrocuted? Answer:- It will but possibly not and such experime
State Huygens ' Principle. For reflection of a plane wave front at a plane reflecting surface, construct the corresponding reflected wave front. Using this diagram, state that angl
Explain the Thermal Equilibrium Thermal Equilibrium occurs when one or more substances reach a common temperature by exchanging heat. When two substances come into thermal contac
In a non-uniform magnetic material, these substances move from stronger parts of the field to the weaker parts.why?
Reverse Characteristic of a Zener diode Reset voltage to zero. Connect zener diode as shown in fig. and reverse characteristics are demonstrated in fig. Raise voltag
Why hot air rises up ?
The energy needed to ionize an atom is known as ionization energy. It is the energy needed to make the electron jump from the present orbit to the infinite orbit.
list the factors used to classify inductors.
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