# Best answer: What must change for electromagnetic induction to occur?

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What must change in order for electromagnetic induction to occur in a wire coil? The magnetic field through the coil must change. … The induced voltage in a coil is proportional to the number of loops, to the area of the loops, and to the rate of change of the magnetic field through the loops.

## What is needed for electromagnetic induction?

The current is said to be induced in the conductor by the magnetic field. One requirement for this electromagnetic induction to take place is that the conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons.

## What does electromagnetic induction depend on?

A magnetic field of changing intensity perpendicular to a wire will induce a voltage along the length of that wire. The amount of voltage induced depends on the rate of change of the magnetic field flux and the number of turns of wire (if coiled) exposed to the change in flux.

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## How does a generator use electromagnetic induction?

A generator is based on the principle of electromagnetic induction. This phenomenon was discovered by Michael Faraday and it states that a current is produced in a conductor when it is moved through a magnetic field. … of how the flux, coil and current interact in order to produce current and electromotive force.

## What four factors affect the induced emf?

Induced e.m.f depends on…?

• Magnetic strength of the core in the coil of wire. (stronger –> bigger emf)
• Number of turns of wire in the coil (more turns –> bigger emf)
• The cross-sectional area of the coil (bigger area –> bigger emf). …
• How fast you move the magnet into/out of the coil.

## How can we induce current in a coil?

Answer: The different ways to induce current in a coil are as follows: (i) If a coil is moved rapidly between the two poles of a horse-shoe magnet, then an electric current is induced in the coil. (ii) If a magnet is moved relative to a coil, then an electric current is induced in the coil.16 мая 2020 г.

## Is electromagnetic induction AC or DC?

Uses & Design Differences. AC and DC generators both use electromagnetic induction to generate electricity. … But in a DC generator, a direct current flows in one direction. In an AC generator, the coil through which current flows is fixed and the magnet usually moves.

## Why does electromagnetic induction happen?

It occurs whenever a magnetic field and an electric conductor move relative to one another so the conductor crosses lines of force in the magnetic field. The current produced by electromagnetic induction is greater when the magnet or coil moves faster, the coil has more turns, or the magnet is stronger.29 мая 2019 г.

## Which electromagnet is the strongest?

The strongest continuous magnetic fields on Earth have been produced by Bitter magnets. As of 31 March 2014 the strongest continuous field achieved by a room temperature magnet is 37.5 T produced by a Bitter electromagnet at the Radboud University High Field Magnet Laboratory in Nijmegen, Netherlands.

## What happens if you move a magnet near a coil of wire?

When a magnet is moved into a coil of wire, changing the magnetic field and magnetic flux through the coil, a voltage will be generated in the coil according to Faraday’s Law. … The polarity of the induced emf is such that it produces a current whose magnetic field opposes the change that produces it.

## Where is Faraday’s law used?

Transformers. Another important application of Faraday’s Law of Induction is the transformer, invented by Nikola Tesla. In this device, alternating current, which changes direction many times per second, is sent through a coil wrapped around a magnetic core.

## What is the device that uses heat to create an EMF?

THE POWERPOT | Thermoelectric Generator

The PowerPot is a thermoelectric generator that uses heat to generate electricity.

## What affects the EMF of a cell?

E.m.f. of a cell depends upon the material of electrodes and electrolyte used in the cell. It is independent of shape of electrodes, distance between electrodes and the amount of electrolyte.

## How do you increase EMF induced in a coil?

Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one …

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## Does induced emf depend on resistance?

From the formula, it is evident that the induced EMF does not depend on the resistance of the coil or wire. However, if the induced EMF produces a current, then that produced current will depend on the resistance of the coil or wire.