Induced EMF in a Coil Inside a Solenoid

The current in a long solenoid with n turns per unit length is increasing with time t according to the equation I = αt, where α is a constant. A small coil with N turns and radius r is positioned inside the solenoid such that its axis is aligned with the solenoid’s axis. What is the magnitude of the induced electromotive force (emf) in the small coil?