A solenoid with 200 turns and cross-sectional area $$4.0 \times 10^{-4} \, \text{m}^2$$ has a current that decreases according to $$I = I_0 e^{-t/\tau}$$, where $$\tau = 0.05 \, \text{s}$$. If the initial magnetic field inside the solenoid is $$0.30 \, \text{T}$$, what is the magnitude of the induced emf in a single-turn coil that surrounds the solenoid at $$t = 0.05 \, \text{s}$$?