Faraday's Law experiment failed? (1 Viewer)

[Tha Wishkah]

Hey, am doing a physics student directed prac task thing, (dont worry ive done all the work dont need you to do ym assignment for me etc)

im constructing faraday's original disc dynamo, where i have two neodinium magnets setting up an electromagnetic field, and by rotating a copper disc in the field, a emf should have been produced.

I've got the disc wired to a voltmeter/ammeter and it detected neglible amounts of reading.

The only thing i can think of preventing a proper reading would be the fact that i didnt use a copper disc, it was aluminium, (non magnetic, but still conducting).

Initially i tested the piece of metal and it was an efficient conductor, but a friend suggested that it may be due to the fact copper has less resistance than aluminium.

any ideas?

 

[Arowana21]

Your friend is right, because even though aluminium is not magnetic, it still induces a current (eddy current) but reading wont be as high due to higher resistance (valence electrons)

Hope this helps a bit.....
if not...then i am sorry to make this comment