All About Electrical & Electronics
The most common used type of capacitors used will be of parallel plate type. If only two plates are used for the capacitor, there are will be disproportionately large to obtain large vales of capacitance. In practice therefore, the construction of parallel plate capacitor have a large number of parallel plates, as shown in fig.1 … Read more
Concentric cylinders can also be considered as co-axial cylinders. The field strength at a radial distance r form an isolated conductor having a charge q coulomb per unit length is given by-E = q/2πε0ε0r Fig 1. shows a section of a cable which can be considered as co-axial cylinder. The radius of the inner conductor … Read more
The lines of force in a capacitor start on one conductor and end on the other conductor. Electrical field is associated with the capacitor. Consider a parallel plate capacitor, Let F be the force of attraction between the plates. If the distance between plates is increased by a small amount dx, work F dx will … Read more
The system of capacitor in parallel is shown in following fig.1 When capacitors are connected in parallel, the potential difference or voltage across each is the same. The total charge is the sum of the charges on each capacitor. The total charge Q = Q1 + Q2 + Q3 Q1 = VC1 ; Q2 = … Read more
A parallel plate capacitor can also have composite dielectrics. Fig 1 shows such a capacitor. Let b be the distance of separation between the two plates in meter. If the thickness of one dielectric is t meter , the thickness of the other dielectric is (d-t) meter. Let dielectric no.1 have permittivity ε1 and the … Read more
If number of individual capacitor having a capacitance C1, C2 and C3 are connected in series, then the total capacitance C is found as follows:_The charge on each capacitor is same so the voltage across each capacitor is V1, V2 and V3 respectively. Show the charge on each capacitor will be:Q1 = C1V1 ; Q2 = C2V2 … Read more
Consider a system of two insulated conductors placed in such a way that if charged on one conducted is +Q, the induced charged on the Other conductor will be -Q. If V is the potential difference between the conductors, for a particular system, the ratio of Q to V is constant, depending on the size … Read more
If we Consider a point charge of a Q coulombs of positive electricity situated at the center of a sphere of a radius r metres, the field strength at any point on the surface is given by Refer to below fig. The electrostatic flux density D can be defined as the number of the lines of … Read more
When two charges Q1 and Q2 are place near each other, a force of attraction or repulsion is produced between them as per Coulomb’s law. At the point occupied by charge Q1 we can imagine that the electrical state of space is caused by other charge Q2. This is due to electrical field caused by … Read more
1. Bodies with like charge repel each other and bodies with unlike charge attract each other. i. e. If two positively charged bodies are placed near each other, they repel each other while if one is positively charged and other is negatively charged, they attract each other. The force of attraction or repulsion between these … Read more