A solenoid with 435 turns has a length of 7.50 cm and a cross-sectional area of 2.90 ✕ 10⁻⁹ m². Find the solenoid's inductance and the average emf around the solenoid if the current changes from +4.00 A to −4.00 A in 6.33 ✕ 10⁻³ s.
A) The solenoid's inductance (in H)
B) The average emf around the solenoid (in V)