Spherical Capacitor A spherical capacitor consists of two concentric spherical conducting shells of radii and , say . The outer shell is earthed. Place a charge on the inner shell. It will reside on the outer surface of the shell. A charge will be induced on the inner surface of the outer shell. A charge Read more about Spherical Capacitor[…]
Conversion of a Galvanometer into Voltmeter A voltmeter is an instrument used to find the potential difference across any two points in a circuit. A galvanometer can directly measure small potential differences only. To measure high potential differences, we have to do some modifications in the galvanometer. What we get after modifications is known as Read more about Conversion of a Galvanometer into Voltmeter[…]
Ammeter A galvanometer can’t be used directly to measure big currents. To measure large currents, we have to carry out some modifications in the galvanometer. What we get after modifications is known as ammeter. An ammeter is a device for measuring the electric current through a wire or a circuit element. The current is the Read more about Ammeter[…]
Energy Density in a Parallel Plate Capacitor Energy density is the total energy per unit volume of the capacitor as the electrostatic energy stored in a parallel plate capacitor is U = ½ CV². Where, for a parallel plate capacitor, and V = Ed; so, , Where Ad = Volume of the capacitor (V). Then Read more about Energy Density in a Parallel Plate Capacitor[…]
Capacitance of a Spherical Conductor (or) Capacitor Capacitor is a device that stores electrostatic field energy. Capacitors provide temporary storage of energy in circuits and can be made to release the energy when required. The property of a capacitor that characterizes its ability to store energy is called its capacitance. When energy is stored in Read more about Capacitance of a Spherical Conductor (or) Capacitor[…]
Average Value of Current Average value of any current in a given time is defined as that constant value of current which will send the same amount of charge in a given circuit as sent by actual current in the same time interval. . . Now, the average value of I = I₀ sin ωt; Read more about Average Value of Current[…]
Combination of Resistances in Series Resistance in a conductor can be defined as the opposition offered to the flow of electrons. Resistance can be joined to each other in two ways: 1. Series Combination: If resistances are connected in series, such that the current flowing through them is the same, the resistances are said to Read more about Combination of Resistances in Series[…]
Combination of Resistances in Parallel Resistance in a conductor can be defined as the opposition offered to the flow of electrons. Resistance can be joined to each other in two ways: Parallel Combination: If the resistances are connected between the same two points such that the potential drop across each resistance is same, then the Read more about Combination of Resistances in Parallel[…]
Solid Angle Subtended by a Disk at a Point on its Axis Solid angle is the cone subtended by an area at the point of interest. The magnitude of solid angle subtended by an area S at a point is defined as its center. Therefore, total solid angle around a point in space is the Read more about Solid Angle Subtended by a Disk at a Point on its Axis[…]
Excess Pressure inside a Liquid Drop and a Bubble On the concave face of a curved surface there is always an excess pressure over the convex face of the surface. The magnitude of excess pressure can be obtained by studying the formation of air and soap bubbles. Excess Pressure in an Air Bubble in Liquid: Read more about Excess Pressure inside a Liquid Drop and a Bubble[…]