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Aafia
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What is emf in the coil? As far as I know about emf is that it is potential difference between two terminals of a source but what if it is induced in coil by changing flux linkage. What exactly happen when emf is induced?
Thank you for the reply!arpon said:When there is EMF in a circuit, electric field is produced across the circuit. Due to this electric field, the free charges (electrons) move and electric current flows.
I meant that electric field is produced in the circuit. Just look at this figure:Aafia said:Thank you for the reply!
This is making sense to me. But does this electric field is produced across battery terminals because what my teacher told me is
"emf is the potential difference between positive and negative terminal of the battery"
More correctly, the Voltage is the potential difference across the terminals of the battery or other PSUAafia said:"emf is the potential difference between positive and negative terminal of the battery"
DaveElectromotive Force is a term from way back before anyone had a clue about what Electricity is. It is an exception which has to be used with care. "emf" is a term that refers to the Potential available from a voltage source when no current passes. It is unfortunate that it has passed into modern usage because it does nothing but cause confusion - in threads like this one. Voltage is not a force. Energy and Force are two different things.
An induced magnetic field is a magnetic field that is created in a material when it is placed in an external magnetic field. This external magnetic field can come from a permanent magnet or from an electric current. The induced magnetic field only exists as long as the external magnetic field is present.
An induced magnetic field is created through a process called electromagnetic induction. This occurs when a conductor, such as a wire, moves through an external magnetic field. The movement of the conductor causes an electric current to flow, which in turn creates a magnetic field.
The main difference between an induced magnetic field and a permanent magnetic field is that an induced magnetic field is temporary and only exists when an external magnetic field is present. A permanent magnetic field, on the other hand, is created in materials that have their own magnetic properties and does not require an external source.
Some common examples of induced magnetic fields include the magnetic fields created in a generator, electric motors, and transformers. In these devices, the movement of conductors through an external magnetic field creates the induced magnetic field that is used to generate electricity or create mechanical motion.
Induced magnetic fields have a wide range of practical applications in everyday life. They are used in generators to produce electricity, in electric motors to power appliances and vehicles, and in transformers to transfer electricity at different voltages. Induced magnetic fields are also used in magnetic levitation trains, MRI machines, and many other technologies.