A rectangular loop of area A is placed in a region where the magnetic field is perpendicular to the plane of the loop. The magnitude of the field is allowed to vary in time according to B=Bmaxe−t/τ,  B=Bmaxe−t/τ, where Bmax and τ are constants. The field has the constant value Bmaxfor t<0 . Find the emf induced in the loop as a function of time.

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