A solenoid with a radius of 8.0103 m and 200 turns / cm is used as an

Question:

A solenoid with a radius of 8.0×10−3 m and 200 turns / cm is used as an inductor in a circuit. When the solenoid is connected to a source of 15 V rms at 22 kHz, an rms current of 3.5 × 10−2 A is measured. Assume the resistance of the solenoid is negligible.
(a) What is the inductive reactance?
(b) What is the length of the solenoid?