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EMF induction question. How to integrate B with respect to A

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'
(edited 7 years ago)
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MrChemKid
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