Forces between Multiple Charges Charge is an inherent property of every atom, an atom is said to be charged if it has irregular number of electrons and protons, an atom is said to be positively charged if it has less number of electrons than protons, and negatively charged if it has more number of electrons Read more about Forces between Multiple Charges[…]
Motional EMF When a conductor is moved across a magnetic field, a potential difference is setup across its ends. This potential difference is called ‘Motional EMF’. Consider the bar in the figure below. It has length l and moves at speed v to the right in magnetic field B, which is directed into the page. The field exerts a magnetic force Read more about Motional EMF[…]
Biot – Savart Law and Its Applications Two French physicists, Jean Baptiste Biot and Felix Savart derived the mathematical expression for magnetic flux density at a point due a nearby current carrying conductor, in 1820. Viewing the deflection of a magnetic compass needle, two scientists concluded that any current element projects a magnetic field in the Read more about Biot – Savart Law and Its Applications[…]
Parallel Plate Capacitor Parallel Plate Capacitors are the type of capacitors which are formed by arrangement of electrodes and insulating material (dielectric). The two conducting plates act as electrodes which are separated by a dielectric between them. The two plates of parallel plate capacitor are of equal dimensions and is connected to power supply. The Read more about Parallel Plate Capacitor[…]
Inductor in Series and Parallel Inductor in Series: Inductor in series are inductors that are placed back – to – back. Below is a circuit where 3 inductors are placed in series. You can see the inductors are in series because they are back – to – back against each other. The best way to Read more about Inductor in Series and Parallel[…]
Solenoid and Toroid Solenoid: A solenoid is a coil of insulated or enamelled wire wound on a rod-shaped form made of solid iron, solid steel, or powdered iron. Devices of this kind can be used as electromagnets, as inductors in electronic circuits, and as miniature wireless receiving antennas. Let us consider a solenoid, such that its length is Read more about Solenoid and Toroid[…]
LC Oscillations The electric current and the charge on the capacitor in the circuit undergo electrical LC oscillations when a charged capacitor is connected to an inductor. The electrical energy stored in the capacitor is its initial charge which is named as qm. It is represented by The inductor contains zero energy. Charge varies sinusoidal with respect Read more about LC Oscillations[…]
Wheatstone bridge For measuring accurately any electrical resistance Wheatstone bridge is widely used. There are two known resistors, one variable resistor and one unknown resistor connected in bridge form as shown below. By adjusting the variable resistor the current through the Galvanometer is made zero. When the current through the galvanometer becomes zero, the ratio Read more about Wheatstone bridge[…]
Combination of Cells A cell is used to maintain current in an electric circuit. We cannot obtain a strong current from a single cell. Hence need arises to combine two or more cells to obtains a strong current. Cells can be combined in two possible ways: 1) Combination of Cells in Series connection: In this Read more about Combination of Cells[…]
Speed of Wave Motion A wave is a disturbance that moves along a medium from one end to the other. If one watches an ocean wave moving along the medium (the ocean water), one can observe that the crest of the wave is moving from one location to another over a given interval of time. The crest Read more about Speed of Wave Motion[…]