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    A right angled triangle is moving with velocity v into a magnetic field as shown in the diagram. I know for the questions asked that you have to find the flux as a function of time, then differentiate to find the emf, But can't find flux as the area is changing. I know to find the flux you must integrate B with respect to area, but not sure how i would carry this out?

    The triangle has adjacent and opposite lengths of 'a'
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