FreeNotes
When the distance between the plates of a capacitor increases, the capacitance decreases because capacitance is inversely proportional to the distance between the plates. The formula for capacitance is: C=ε0⋅A/d Where: C is the capacitance, ε0 is the permittivity of free space, A is the area of the plates, d is the distance between the … Read more
A pointed tip helps in the easy discharge of electric charge into the air due to the concentration of charge at the sharp end. This prevents the buildup of large charges, reducing the chances of a lightning strike on the building. Related Questions: Two parallel straight conductors carrying current in the same direction attract each … Read more
Walking on a carpet causes friction, which transfers electrons to or from the body, creating static charge buildup. When the person touches a metal object (a conductor), the charge quickly discharges, causing a small electric shock. Related Questions: Two parallel straight conductors carrying current in the same direction attract each other? Explain why. What will … Read more
When a charged balloon is brought near a neutral wall, it induces an opposite charge on the surface of the wall. Since opposite charges attract, the balloon sticks to the wall due to electrostatic attraction. Related Questions: Two parallel straight conductors carrying current in the same direction attract each other? Explain why. What will you … Read more
Transformer: A transformer is an electrical device used to change the voltage level of an alternating current (AC) in a circuit. It operates on the principle of electromagnetic induction to either step up (increase) or step down (decrease) the voltage. It works only with AC and is widely used in power transmission, electrical appliances, and … Read more
Mutual Induction is a phenomenon where a change in current in one coil induces a voltage in a second nearby coil due to the magnetic field created by the first coil. This principle is based on Faraday’s Law of Electromagnetic Induction and plays a key role in many electrical devices such as transformers, inductors, and … Read more
An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy by the process of electromagnetic induction. It produces alternating current (AC), which periodically reverses direction, in contrast to direct current (DC), which flows in one direction only. Construction of an AC Generator: The main components of an … Read more
To show that the induced current and induced electromotive force (emf) in a circuit follow the law of conservation of energy, we need to connect the concept of electromagnetic induction to the physical principle of energy conservation. Key Concepts: Faraday’s Law of Induction states that the induced emf (ε) in a loop is proportional to … Read more
Electromagnetic Induction: Electromagnetic induction is the process by which a changing magnetic field induces an electromotive force (emf) or voltage in a conductor. This phenomenon is described by Faraday’s Law of Induction, which states that the magnitude of the induced emf is proportional to the rate of change of the magnetic flux through a circuit. … Read more
What is a DC Motor? A DC motor (Direct Current motor) is an electric motor that runs on direct current (DC) electricity. It converts electrical energy into mechanical energy through the interaction of magnetic fields. DC motors are commonly used in applications where precise control of speed and torque is required, such as in electric … Read more