Magnetic flux against e.m.f (V)

  • Thread starter Googl
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  • #1
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Hi,

Could someone confirm for me please. As the magnetic flux increases does the e.m.f increase as well? (solenoid) And if we were to plot a graph of the two against each other, the graph will have a positive line/curve. My graph has a negative curve suggesting that as flux increases e.m.f decreases, that's wrong right?

Thanks.
 

Answers and Replies

  • #2
marcusl
Science Advisor
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It depends on how you defined the positive and negative terminals of your solenoid relative to the field inside. Here's how to figure it out.

A changing magnetic flux [tex]\phi[/tex] produces a "back emf" [tex]\varepsilon[/tex] according to

[tex]\varepsilon=-\frac{d\phi}{dt}[/tex]

According to Lenz's Law, the sign of the emf is such as to produce a current that produces a flux that opposes the external change in flux.
 

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