Q&A

What causes the magnetic flux to change at the coil?

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What causes the magnetic flux to change at the coil?

The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.

What causes a change in flux?

As seen in previous Atoms, any change in magnetic flux induces an electromotive force (EMF) opposing that change—a process known as induction. Motion is one of the major causes of induction. For example, a magnet moved toward a coil induces an EMF, and a coil moved toward a magnet produces a similar EMF.

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What happens when magnetic flux linked with a coil changes?

Whenever the magnet flux linked with a coil changes, then is an induced emf in the circuit. This emf lasts. so long as the change in flux takes place.

How do you find the magnetic flux of a coil?

The magnitude of the induced emf can be calculated using Faraday’s law.

  1. The magnetic field inside the long coil is B = μ0(N/ℓ)I.
  2. The flux through the coil is NBA = μ0(N2/ℓ)IA.
  3. The change in flux per unit time is μ0(N2/ℓ)A ∆I/∆t = L*∆I/∆t, since I is the only quantity changing with time.

How is magnetic flux produced?

If we use the field-line picture of a magnetic field then every field line passing through the given area contributes some magnetic flux. A field line passing through at a glancing angle will only contribute a small component of the field to the magnetic flux.

When a magnet is moved towards a coil then?

When a magnet is moved towards the coil then a current is induced in the coil due to the phenomenon of electromagnetic induction. Due to the relative movement between the magnet and the coil an electromotive force (EMF) is induced which in turn causes the current in the coil.

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When the magnetic flux linked with a closed circuit changed then ___ will be induced in the circuit?

Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called electromagnetic induction.

How do you change magnetic flux?

There are three ways to change the magnetic flux through a loop:

  1. Change the magnetic field strength (increase, decrease) over the surface area.
  2. Change the area of the loop (increase by expanding the loop, decrease by shrinking the loop)