# What is the dynamically induced EMf?

An e.m.f. that is dynamically caused An e.m.f. will be induced if a conductor is moved in a magnetic field in such a way that it crosses the field's lines of force. If the conductor is moved along the lines of force or lies in the plane of the field, no e.m.f. is produced. If the conductor is moved away from the line of forces or out of this plane, then it will produce an e.m.f.

In physics and engineering, induction is the process by which a change in magnetic flux induces voltage across a conductor. The magnetic flux changes because of the current flowing through the conductor, which produces a magnetic field around the conductor. Any metal object with a current passing through it will produce a magnetic field around it. This is true even if the metal object is moving too fast to be seen by the human eye; its electrical wires still induce a magnetic field even though we cannot see it.

The term "induction" comes from the fact that the voltage appears on the conductor only when the loop is closed by connecting one end to another conductor or back to the first, so induction is the production of voltage within a circuit due to a change in magnetic flux.

Induction has many important applications in technology and science. It is at the heart of inductive power transmission systems, such as electric power transmission using transformers, and inductors used in electronics and radio frequency (rf) circuits.

## How is electromotive force induced in the conductor?

When the flux connections change, an emf is induced in a coil or conductor. Motional emf refers to the electromotive force generated by motion. The emf is dynamically induced when the change in flux linkage is caused by a change in the magnetic field around the stationary conductor. This can occur when another magnet is moved into or out of alignment with it.

Emitters such as light bulbs and neon signs produce light or heat because of the electrical resistance of their coils. This resistance creates a voltage across the coil which causes more current to flow through it. The increased number of loops in a transformer's core result in higher inductance values which leads to more voltage being produced when a load is placed across its secondary side. This is why transformers are used to increase the voltage available from a source. They also allow power to be distributed to several points simultaneously.

Electricity is the flow of electrons through a conductor. Electrons are negatively charged particles that exist within any material that has an atomic nucleus, such as atoms inside of rocks or humans. They are attracted to other materials with positive charges, such as ions within our body or at least +16 volts battery terminals. When two objects with different voltages are connected together, electrons will flow from the object with the higher voltage to the lower one.

Electric circuits always involve two elements: a conductor and a device that produces a dynamic effect on the flux linking the elements.

## What is dynamically induced EMF?

"Dynamically induced emf" refers to an emf generated in a conductor as it travels across a magnetic field. The graph depicts what happens when a conductor "A" with a length of "L" passes through a "B" wb/m2. If the flux density is constant with "V" velocity, then the conductor experiences dynamically generated emf. Such emf will be in direct opposition to the current flowing into its terminal wires.

This effect was first described by Michael Faraday in 1831 and has many applications in science and technology. For example: Magnetic fields can induce emfs in conductors, such as cables or wire meshes. These induced emfs could cause problems for devices that use electricity, such as radio-frequency identification (RFID) tags or sensors. An RFID tag contains circuitry used to transmit data back to an RFID reader via inductive coupling. This induces a voltage into the conductor running between the tag and reader. This voltage could cause problems for devices that use electricity, such as radio-frequency identification (RFID) tags or sensors.

## What is statically induced emf?

A statically induced emf is the emf induced in a coil as a result of a change in flux coupled to it (the change in flux is generated by an increase or reduction in current). A statically induced emf is exemplified by a transformer. In this example, the windings are fixed, but the magnetic field is moving around the conductor, creating the emf. Current through the primary induces a secondary emf in the secondary circuit.

Statically induced emfs can be either positive or negative depending on the direction of the current in the primary. If the current flows into the core of the transformer, then the emf will be positive. If the current flows out of the core of the transformer, then the emf will be negative. This is because areas of the core that are crossed by the primary current will have their magnetic fields add together while areas crossed by the opposite secondary current will have their fields cancel each other out. Thus, more current leads to more positive emf and less current leads to more negative emf.

Statistically induced emfs can also be referred to as self-induced emfs since they arise from changing currents within the circuit. These changes in current may be due to external factors such as another coil in the circuit being closed by a switch for example, or they may be due to internal factors such as one section of the circuit becoming overloaded. No matter what cause is given, the end result is always the same: current changes which in turn create emf's.

##### Marian Hargrove

Marian Hargrove is a teacher who has been in the education field for over 10 years. Marian is passionate about helping her students reach their full potential and strives to make learning fun and interesting for all of her pupils. She graduated from the University of New Mexico with a Bachelor's degree in Elementary Education.