How to Calculate Induced EMF Using Graphical Analysis?

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maya.enid
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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 don't quiete arive to the right answer
 

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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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