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Emf using graphical analysis

  1. Mar 26, 2012 #1
    If i am given a graph of B(magnetic field) vs Time,how can i find the induce emf from this graph?? I know that the emf=-Nd∅/dt and ∅=BAcosθ but somehow i dont quiete arive to the right answer
     

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  3. Mar 26, 2012 #2

    K^2

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    Well, in BAcosθ, A and θ are kept constant, so EMF is -NAcosθ dB/dt. So what did you get for dB/dt?
     
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