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javen · Oct 19, 2009, 10:16 AM

Imagine a varying magnetic field is confined to an area smaller than that of a conducting loop surrounding it. We know there is an induced emf in the loop. Will the induced emf be the same if the same magnetic field is used but the loop is now as big as the solar system?

Unknown008 · Oct 19, 2009, 10:28 AM

Well, what do you think is the answer. What affects the emf produced by a magnet? If you get it wrong, we'll explain it to you. :)

javen · Oct 19, 2009, 10:36 AM

Originally Posted by Unknown008

Well, what do you think is the answer. What affects the emf produced by a magnet? If you get it wrong, we'll explain it to you. :)

Seems to me there ought to be an emf also but should be a weaker one since the loop is very far from the magnetic field.:confused:

Unknown008 · Oct 19, 2009, 10:45 AM

Correct! :)

The emf produced depends on the rate and the number of lines of the magnetic field that cut the loops. If the loops are further apart, the rate decreases.

This is a rough sketch I did. When the loop is smaller, the lines of fields cut the small loops more frequently than if the loops were larger:

Name: Test.png
Views: 317
Size: 3.3 KB

javen · Oct 19, 2009, 10:57 AM

Originally Posted by Unknown008

Correct! :)

The emf produced depends on the rate and the number of lines of the magnetic field that cut the loops. If the loops are further apart, the rate decreases.

This is a rough sketch I did. When the loop is smaller, the lines of fields cut the small loops more frequently than if the loops were larger:

Name: Test.png
Views: 317
Size: 3.3 KB

Thanks:p

Unknown008 · Oct 19, 2009, 10:59 AM

You're welcome! :)