I need help

A solenoid is made of N turns of a wire, wrapped around a hollow cylinder of radius r - 2.8 cm and length ( - 13 cm. (a) When the current is varied in the solenoid, an emf is induced. By using the two plots shown below, determine the inductance of the solenoid. (4 marks) (b) Calculate the number of turns N in the solenoid. (Hint: the induc- tance of a solenoid is given by: L - HON?mr?/(.) (2 marks) (c) If the current is then kept at / = 10.0 A, determine the total mag- netic flux through the solenoid. (Hint: the total flux through the solenoid is No. There is an equation on your formula sheet that relates Nd to the inductance and current.) (2 marks) -0.50 10.0 current [A] 6.0 emf [m V] 1.0 21 0.0 4.0 8.0 12.0 -1.5 16.0 4.0 8.0 12.0 16.0 time [s] time [s]