A rectangular loop of area A = 0.160 m2 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 = 0.350 e-t/2.00, where B is in teslas and t is in seconds. The field has the constant value 0.350 T for t < 0. What is the value for ε at t = 4.00 s?

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