The magnetic field within a long, straight solenoid with a circular cross section and radius r is increasing at a rate of db/dt. ( include pictures and graphs)

a) what is the rate of change of flux through a circle with radius r1 inside the solenoid, normal to the axis of the solenoid, and with center on the solenoid axis?

b) find the magnitude of the induced electric field inside the solenoid, at a distance r1 from its axis.

c) what is the magnitude of the induced electric field outside the solenoid, at a distance r2 from the axis?

d) what is the magnitude of the induced emf in a circular turn of radius r/2 that has its center on the solenoid axis?

e) what is the magnitude of the induced emf if the radius in part d) is r?

f) what is the induced emf if the radius in part d is 2r?