Induced EMF in a Solenoid

The axis of a solenoid with 1000 turns and a cross-sectional area of $2.0 \times 10^{-4}$ m² is parallel to a magnetic field. The magnitude of the magnetic field varies with time $t$ according to the equation $B(t) = (0.30\ \text{T})e^{-t/\tau}$, where $\tau = 0.20\ \text{s}$. What is the magnitude of the induced emf in the solenoid at $t = 0.10\ \text{s}$?