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B Relation between current and flux

  1. Aug 1, 2017 #1


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    So I learnt that voltage/emf is proportional to the negative change in flux so the graph of the voltage is the negative derivative of the flux graph.

    What is the relation between flux and current. In a motor, a change in flux induces a current that creates an opposing magnetic field, and since current is proportional to magnetic field strength, does that mean flux is proportional to current in the coil. So does this mean current and flux will have a similar shaped graph over time?

  2. jcsd
  3. Aug 1, 2017 #2


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    I didn't follow your motor example. Which motor are you talking about?
    Yes, but only if there is no magnetic saturation.

    Φ=LI, where L is the inductance of the coil, which is a constant.
    So, flux∝current.
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