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Fields and Their Consequences

Magnetic flux and flux linkage

  • 6 things to know
  • Papers 2 and 3

Overview

Magnetic flux and flux linkage, and how both vary for a rotating coil.

What you need to know

Answer each one before you reveal it.

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Numbers

What orientation does Φ = BA assume, and what happens when the field is at an angle?

Numbers

What units do magnetic flux and flux linkage take, and what is the formula for a rotating coil?

Numbers

What does N stand for, and what is the flux linkage when the coil face is perpendicular or parallel?

Numbers

Which quantities give magnetic flux, and how does orientation enter the formula?

Key term

What unit does magnetic flux take, and how do flux and flux linkage differ?

Numbers

What apparatus investigates how flux linkage varies, what does the oscilloscope show, and why is an oscilloscope used rather than a voltmeter?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State the formula for magnetic flux and define each term in the equation.

    Model answer

    Φ = BA, where Φ is magnetic flux, B is magnetic flux density, and A is the area perpendicular to the magnetic field.

  2. 2

    What condition must be satisfied regarding the orientation of the magnetic field for the formula Φ = BA to apply?

    Model answer

    The magnetic field B must be normal (perpendicular) to the area A.

  3. 3

    Why does the formula Φ = BA give incorrect results if the field is not perpendicular to the area?

    Model answer

    Because only the component of the field perpendicular to the area contributes to the flux; if the field is at an angle, the effective flux is reduced.

  4. 4

    What is the SI unit of magnetic flux?

    Model answer

    The weber (Wb).

  5. 5

    Define flux linkage and state its formula.

    Model answer

    Flux linkage is defined as NΦ, where N is the number of turns of wire cutting the flux and Φ is the magnetic flux through each turn.

  6. 6

    What is the unit of flux linkage?

    Model answer

    The weber-turn (Wb turns).

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