A 300 turn solenoid with length of 20.0 cm and a radius of 1.50 cm carries a current of 2.00 A. A second coil of four turns is wrapped tightly around this solenoid, so it can be considered to have the same radius as the solenoid. The current in the 300 turns solenoid increases steadily to 5.00 A in 0.900 s.
(b) Calculate the magnetic field of the 300 turns solenoid after 0.900 s
(c) Calculate the area of the 4 turn coil.
(d) Calculate the change in the flux through the 4 turn coil during the same period

Question

A 300 turn solenoid with length of 20.0 cm and a radius of 1.50 cm carries a current of 2.00 A. A second coil of four turns is wrapped tightly around this solenoid, so it can be considered to have the same radius as the solenoid. The current in the 300 turns solenoid increases steadily to 5.00 A in 0.900 s.
(b)	Calculate the magnetic field of the 300 turns solenoid after 0.900 s
(c)	Calculate the area of the 4 turn coil.
(d)	Calculate the change in the flux through the 4 turn coil during the same period