Chapter-6|Electromagnetic Induction (EMI)| NCERT 12th Physics: Faraday’s Law of Electromagnetic Induction: The two laws of electromagnetic induction given by Faraday are as under. 1. Faraday’s First Law: Whenever there is a relative motion between a magnet and a coil, then magnetic flux linked with coil changes and an EMF is induced in the coil. If conductor […]

Chapter-6|Electromagnetic Induction (EMI)| NCERT 12th Physics: Experiments of Faraday and Henry on EMI: It is the relative motion between the magnet and closed coil which is responsible for generation of induction of electric current in the coil. First Experiment(Current Induced by Magnet): In this experiment, we consider a coil C of few turns of conducting

Chapter-6|Electromagnetic Induction (EMI)| NCERT 12th Physics: Electromagnetic Induction(EMI): The phenomenon of generation of current or EMF by changing the magnetic field is known as electromagnetic induction. Magnetic Flux: The total number of magnetic field lines crossing through any surface normally, when it is placed in a magnetic field is known as magnetic flux of that

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Permanent Magnets: The substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Permanent magnet can be made by placing a rod of ferromagnetic material in a current carrying solenoid. The magnetic field of the solenoid magnetises the rod. The

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Properties of Materials: Materials can be classified as diamagnetic, paramagnetic and ferromagnetic on the basis of susceptibility. Diamagnetism: Diamagnetic substances are those substances which have a tendency to move from stronger to the weaker part of the external magnetic field. When a bar of diamagnetic material is placed

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Field Strength at a Point Due to a Bar Magnet: The Strength of magnetic field at any point is defined as, the force experienced by a hypothetical unit north pole placed at that point. It is a vector quantity. The direction of magnetic field B is the direction

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Conversion of Galvanometer to Voltmeter: Voltmeter: A device used to measure potential difference in a appliance. Voltmeter is always connected in parallel with appliance.   Important Concept: The resistance of an ideal voltmeter should be infinity. Example: A voltmeter whose coil has resistance 10 ohm, gives full scale

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Conversion of Galvanometer Into an Ammeter: Ammeter: A device used to measure electric current. Ammeter is always connected in series with appliance. A galvanometer can be converted into an ammeter by connecting a very low resistance called (shunt S) in parallel with galvanometer. Since, Potential difference across Galvanometer

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Moving Coil Galvanometer: Galvanometer is used for detecting and measuring small electric currents. Principle: Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. Construction: The moving coil galvanometer consists of a coil with a

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Torque On a Current Loop In a Uniform Magnetic Field (Magnetic Dipole): Let we consider a rectangular loop ABCD be suspended in a uniform magnetic field B. Let AB=CD=b and AD=BC=a and I be the current flowing through the loop. Case-1:The rectangular loop is placed such that the