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    An a.c. generator consists of a magnet rotating inside a cavity in a soft iron core. The output from the coil, wound on the iron core, is connected to an oscilloscope.
    How would removing the soft iron core affect the output voltage shown on the oscilloscope screen?

    Hmmm. I'm thinking that if the soft iron core was removed, it would be less easy for the magnet to magnetise and demagnetise. This means that energy will be wasted (as lost volts??), so the output voltage (e.m.f.) will decrease.

    Is this correct?
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    (Original post by LeCroissant)
    An a.c. generator consists of a magnet rotating inside a cavity in a soft iron core. The output from the coil, wound on the iron core, is connected to an oscilloscope.
    How would removing the soft iron core affect the output voltage shown on the oscilloscope screen?

    Hmmm. I'm thinking that if the soft iron core was removed, it would be less easy for the magnet to magnetise and demagnetise. This means that energy will be wasted (as lost volts??), so the output voltage (e.m.f.) will decrease.

    Is this correct?
    The iron core channels the magnetising field throughout the length of the stator coils. If the core were removed, the magnetic flux within the coils will diminish causing a loss of e.m.f. according to Faradays laws.

    In other words removing the core has the same effect as greatly reducing the number of turns in the coils or reducing the magnetising flux.
 
 
 
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