All About Electrical & Electronics
Figure shows a coil of conductor carrying in clockwise direction. The point P is marked at a distance x from the center of the coil and it is desired to find strength at the point due to current carried by the coil. Let ds and ds’ be elements of the conductor and the distance of … Read more
Figure 1 shows a straight solid conductor in which the steady current I is flowing in upwards direction. The magnetic flux is produced due to current flowing in the conductor. The magnetic flux is produced outside the conductor along its complete length. The flux lines are in one plane and are perpendicular to the direction … Read more
If a compass is brought near a electric current carrying conductor, needle deflects which shows the presence of magnetic field around conductor. It has been observed that magnetic flux exists in circles around the conductor as shown in figure (c) and (d). The direction of current in the conductor and direction of field produced is … Read more
We have seen that when two parallel conductors carry current, there is a magnetic field produced between them, which cause force between the conductors. It can be regarded that one conductor produced magnetic field and sets up the side thrust on the other conductor. If the flux density is denoted by B, the force can … Read more
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