what is the induced emf in the coil?

what is the induced emf in the coil?

A very long, hollow conductor carries a current in its circumferential direction. What is the magnetic field inside it?2) A 10-turn coil is in the xy-plane. The B field is in the z direction and is increasing at a rate of 10 T/hr. If the area of the loop is 20 cm2, what is the induced emf in the coil? What is the flux linking the loop?